Trade Customers with previously established accounts may submit purchase orders by email to or by telephone to (01) 508 888-9113, or by mail to Trade Orders/WPI, P.O. Box 1240, Sagamore Beach, MA 02562—1240, USA.

To establish a trade account, please provide us with full particulars, including billing and shipping address(es), special handling requirements, and SAN #. Our trade terms may be found in the current edition of the ABA Handbook.


Recently published books may be returned for full credit excluding shipping charges within 60 days from the date of the original invoice; thereafter no credit will be issued. A return authorization is required and may be requested via email to Included with the request please reference your invoice number and a description of the books to be returned. Once your request has been approved, you will receive a return authorization by fax or email (please indicate your preference) with instructions for shipping the books to our warehouse. Kindly pack books carefully. Include a copy of the authorization within the package. Only books in mint saleable condition will be accepted. The decision of the warehouse receiving department regarding salability is final and no damaged books will be returned to the shipper. Books returned without prior authorization will be refused by our warehouse.

Upon receipt of your returns and warehouse approval, a credit memo will be issued for your account. Please contact us with any questions.