Cita APA (7th ed.)
Whitcomb Alan. (1980). Comprehensive commerce (ed.). Nelson House.
Cita Chicago (17th ed.)
Whitcomb Alan. Comprehensive Commerce. ed. Hong Kong: Nelson House, 1980.
Cita MLA (9th ed.)
Whitcomb Alan. Comprehensive Commerce. ed. Nelson House, 1980.
Atenció: Aquestes cites poden no estar 100% correctes.