Cita APA (7th ed.)
Fortenbaugh, R. (1948). The nine Capitals of the United States. Maple Press.
Cita Chicago (17th ed.)
Fortenbaugh, Robert. The Nine Capitals of the United States. York, Penns: Maple Press, 1948.
Cita MLA (9th ed.)
Fortenbaugh, Robert. The Nine Capitals of the United States. Maple Press, 1948.
Atenció: Aquestes cites poden no estar 100% correctes.