Cita APA (7th ed.)

Phelps, O. W. (1950). Introduction to labor economics. McGraw-Hill.

Cita Chicago (17th ed.)

Phelps, Orme Wheelock. Introduction to Labor Economics. New York: McGraw-Hill, 1950.

Cita MLA (8th ed.)

Phelps, Orme Wheelock. Introduction to Labor Economics. McGraw-Hill, 1950.