Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.