Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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