To register, open the New registration page and fill in the required fields. After completing registration, you will receive registration confirmation by email.

Yes, you can change the registration information anytime you want. To do so, log in on one of the LIDEL Group websites and in your account, access the Edit Data page. You will be forwarded to LIDEL's website, where you can change your information.

If you forget your password, go to the Login page and enter your email in the appropriate section ('Forgot your password?') so we can send you an email for retrieving your password.

The privacy and security of your information is of the greatest concern for the LIDEL Group. For more information, see Privacy and Security Policy.

When you register on the LIDEL Group websites, you have the possibility to subscribe our newsletter. As an alternative, you can enter your email in the Newsletter section on the left-hand side of the LIDEL Group website pages.

The LIDEL Group newsletter is sent once a month. Occasionally, you may also receive newsletters with promotions and other special campaigns.

At the end of every newsletter you will find a link to cancel your subscription.

The back cover is the back part of a book, which typically features the presentation text (blurb) of the book as well as the barcode and the publication's ISBN code.

To order a product, you must be registered on one of the LIDEL Group websites. You need to add the book to your 'Shopping Cart' by clicking the 'Buy' button next to the product. As you add items to your order, the value of your order will be updated in the upper right corner of the page. When you finish your order, click on 'Shopping Cart' to be redirected to LIDEL's website, where you can see your complete shopping list. LIDEL is the official distributor of PACTOR.

You can leave your order whenever you want, provided you haven't completed payment yet. You may add and remove items to/from your Cart and resume the ordering process. Any items that you have already added to your 'Shopping Cart' will remain in the Cart.

A product stating 'Subject to Confirmation' means that the stock is limited. If your order cannot be completed by the estimated due date, or if it cannot be completed altogether, you will be notified by email within two working days.

If it isn't possible to deliver an order that has already been paid for fully or in part, the value of the undelivered product will be refunded within 15 days at the most. You may opt for receiving the amount through a shopping voucher to be used on one of our websites, or by bank transfer to your IBAN account.

You can choose between the following payment methods: credit card, ATM or Bank Transfer. Orders placed using the ATM and Bank Transfer methods will be valid for a period of 15 days. If no payment is received within that period of time, the order will be cancelled.

As soon as you complete your order, you will receive a confirmation email with the description and quantity of all ordered products, your billing and delivery details and the amount to be paid. You should keep this message until you receive your order, as it is your proof that the order was placed successfully.

If you cannot complete your order, you may finish it at a later time. After logging in on one of the LIDEL Group websites, your 'Shopping Cart' will show a list of any products you may have added previously.

After moving on to your 'Shopping Cart', you will be prompted to enter your voucher code. The voucher amount will be deducted from the total of your order. You can only use one voucher per order.

Shipping charges are calculated based on the delivery address and the total weight of the order. During the ordering process, after entering the delivery address and before accepting and completing the order, the shipping charges to be paid will be shown.

Used books may be sunned, rubbed, have a small tear, a dinged corner, a creased spine, or other defects.

No. In terms of content, used books are exactly like new books, but with the possible defects described above.

You need to fill in the form available in the Author Area. Your proposal will be analysed by our Editorial Department, which will later contact you.

The LIDEL Group is the largest Portuguese editorial group for technical books, comprising six specialised brands in distinct areas. To know all the thematic areas covered by the LIDEL Group, refer to the section Brands and Editorial Areas.

The ISBN (International Standard Book Number) is the exclusive number that identifies a given publication. You can find your book's ISBN book on the back cover next to the barcode. In case of eBooks, you can find the ISBN in the credits.

The fixed-price law determines that a book cannot be sold to the public with more than 10% discount on the Retail Price set by the publisher, in the first 24 months after the date of its first publication, except exclusions defined by law.To know more about this legislation, see the Portuguese Association of Publishers and Booksellers website.