Cita APA (7th ed.)
Risley, G. (1972). Modern industrial marketing. McGraw-Hill.
Cita Chicago (17th ed.)
Risley, George. Modern Industrial Marketing. New York: McGraw-Hill, 1972.
Cita MLA (9th ed.)
Risley, George. Modern Industrial Marketing. McGraw-Hill, 1972.
Atenció: Aquestes cites poden no estar 100% correctes.