Cita APA (7th ed.)
Waud, R. N. (1986). Economics (3rd ed.). Harper.
Cita Chicago (17th ed.)
Waud, Roger N. Economics. 3rd ed. New York: Harper, 1986.
Cita MLA (9th ed.)
Waud, Roger N. Economics. 3rd ed. Harper, 1986.
Atenció: Aquestes cites poden no estar 100% correctes.