Cita APA (7th ed.)

Friedrich, K. (1974). International economics: Concepts and issues. McGraw-Hill.

Cita Chicago (17th ed.)

Friedrich, Klaus. International Economics: Concepts and Issues. New York: McGraw-Hill, 1974.

Cita MLA (9th ed.)

Friedrich, Klaus. International Economics: Concepts and Issues. McGraw-Hill, 1974.