The buyer's manual,
by Merchandise managers' division of the National retail dry goods association.

APA Citation

National retail dry goods association (U.S.) Merchandise managers' division. (1930). The buyer's manual. New York: National retail dry goods association.

MLA Citation

National retail dry goods association (U.S.) Merchandise managers' division. The Buyer's Manual. New York: National retail dry goods association, 1930.

Warning: These citations may not always be complete (especially for serials).