Samuelson, p. a. (1967). Economic: An introduction analysis/7e (7th ed.). Mcgraw hill.
Dyfyniad Arddull ChicagoSamuelson, paul a. Economic: An Introduction Analysis/7e. 7th ed. New York: Mcgraw hill, 1967.
Dyfyniad MLASamuelson, paul a. Economic: An Introduction Analysis/7e. 7th ed. Mcgraw hill, 1967.
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