APA استشهاد

Samuelson, p. a. (1967). Economic: An introduction analysis/7e (7th ed.). Mcgraw hill.

استشهاد بنمط شيكاغو

Samuelson, paul a. Economic: An Introduction Analysis/7e. 7th ed. New York: Mcgraw hill, 1967.

MLA استشهاد

Samuelson, paul a. Economic: An Introduction Analysis/7e. 7th ed. Mcgraw hill, 1967.