Cita APA (7th ed.)
Maline, J. L., & Berkley, J. (1967). The twentieth century. Singer.
Cita Chicago (17th ed.)
Maline, Julian L., i James Berkley. The Twentieth Century. New York: Singer, 1967.
Cita MLA (9th ed.)
Maline, Julian L., i James Berkley. The Twentieth Century. Singer, 1967.
Atenció: Aquestes cites poden no estar 100% correctes.