APA

(1977). American book trade directory: booksellers and publishers in the United States, Canada, the United Kindom, and Ireland. New York: Bowker.

Chicago

1977. American book trade directory: booksellers and publishers in the United States, Canada, the United Kindom, and Ireland. New York: Bowker.

Harvard

(1977). American book trade directory: booksellers and publishers in the United States, Canada, the United Kindom, and Ireland. New York: Bowker.

MLA

American book trade directory: booksellers and publishers in the United States, Canada, the United Kindom, and Ireland. New York: Bowker. 1977.