APA (7e ed.) Bronvermelding

Walker, F. R. (1952). Practical accounting and cost keeping for contractors; a treatise on modern business methods. F. R. Walker Co.

Chicago (17e ed.) Bronvermelding

Walker, Frank Rabold. Practical Accounting and Cost Keeping for Contractors; a Treatise on Modern Business Methods. Chicago: F. R. Walker Co, 1952.

MLA (9e ed.) Bronvermelding

Walker, Frank Rabold. Practical Accounting and Cost Keeping for Contractors; a Treatise on Modern Business Methods. F. R. Walker Co, 1952.