APA استشهاد

Phelps, O. W. (1955). Introduction to labour economics/4e (4th ed.). McGraw Hill.

استشهاد بنمط شيكاغو

Phelps, Orme W. Introduction to Labour Economics/4e. 4th ed. New York: McGraw Hill, 1955.

MLA استشهاد

Phelps, Orme W. Introduction to Labour Economics/4e. 4th ed. McGraw Hill, 1955.