Cita APA (7th ed.)
Spencer, M. (1983). Contemporary economics (5th. ed.). Worth.
Cita Chicago (17th ed.)
Spencer, Milton. Contemporary Economics. 5th. ed. New York: Worth, 1983.
Cita MLA (9th ed.)
Spencer, Milton. Contemporary Economics. 5th. ed. Worth, 1983.
Atenció: Aquestes cites poden no estar 100% correctes.