Gaya APA

Samuelson, P, A. (1961). Economics : an introductory analysis / Paul A. Samuelson (Ed.ke-5). New York: McGraw-Hill book company.

Gaya MLA

Samuelson, Paul, A.. "Economics : an introductory analysis / Paul A. Samuelson". Ed.ke-5 New York: McGraw-Hill book company, 1961. Textbook.