Bartleby's Bookshop is a member of the Antiquarian Booksellers Association of America(ABAA). The mission of the ABAA is to promote ethical standards and professionalism in the antiquarian book trade, to encourage the collecting and preservation of antiquarian books and related materials, to support educational programs and research into the study of antiquarian books, and to facilitate collegial relations between booksellers, librarians, scholars, and collectors.

Bartleby's Bookshop is also a member of The International League of Antiquarian Booksellers (ILAB). The League publishes and upholds a code of practice based on wide experience of all its national associations. The code is binding on all members. It is a mark of success of this code that disputes are rare. If disputes should arise, the League mediates, and its authority ensures that judgments are implemented.