APA استشهاد

Helmkamp, J. G., Imdieke, L. F., & Smith, R. E. (1983). Principles of accounting. John Wiley & Sons.

استشهاد بنمط شيكاغو

Helmkamp, John G., Leroy F. Imdieke, و Ralph E. Smith. Principles of Accounting. New York: John Wiley & Sons, 1983.

MLA استشهاد

Helmkamp, John G., et al. Principles of Accounting. John Wiley & Sons, 1983.