APA (7e ed.) Bronvermelding

Spengler, E. H. 1., & Klein, J. 1. (1955). Introduction to business. McGraw-Hill.

Chicago (17e ed.) Bronvermelding

Spengler, Edwin Harold 1906, en Jacob 1896 Klein. Introduction to Business. New York: McGraw-Hill, 1955.

MLA (9e ed.) Bronvermelding

Spengler, Edwin Harold 1906, en Jacob 1896 Klein. Introduction to Business. McGraw-Hill, 1955.