APA-referens (7:e uppl.)

Helmkamp, J. G., Imdieke, L. F., & Smith, R. E. (1989). Principles of accounting (Third edition.). John Wiley & Sons.

Chicago-referens (17:e uppl.)

Helmkamp, John G., Leroy F. Imdieke, och Ralph Eugene Smith. Principles of Accounting. Third edition. New York: John Wiley & Sons, 1989.

MLA-referens (9:e uppl.)

Helmkamp, John G., et al. Principles of Accounting. Third edition. John Wiley & Sons, 1989.