APA (7e ed.) Bronvermelding

Walsh, J. H. (1919). Walsh's business arithmetic. The Gregg Pub. Co..

Chicago (17e ed.) Bronvermelding

Walsh, John H. Walsh's Business Arithmetic. New York : Boston [etc.]: The Gregg Pub. Co., 1919.

MLA (8e ed.) Bronvermelding

Walsh, John H. Walsh's Business Arithmetic. The Gregg Pub. Co., 1919.