Cita APA (7th ed.)
Graham, F. D. (1942). Protective tariffs. Princeton University Press.
Cita Chicago (17th ed.)
Graham, Frank D. Protective Tariffs. Princeton, New Jersey: Princeton University Press, 1942.
Cita MLA (9th ed.)
Graham, Frank D. Protective Tariffs. Princeton University Press, 1942.
Atenció: Aquestes cites poden no estar 100% correctes.