Philbrick, A. K. (1963). This human world. Wiley.
Cita Chicago (17th ed.)Philbrick, Allen K. This Human World. New York: Wiley, 1963.
Cita MLA (8th ed.)Philbrick, Allen K. This Human World. Wiley, 1963.
Atenció: Aquestes cites poden no estar 100% correctes.