Cita APA (7th ed.)

Halsey, W. D., & Johnston, B. (1990). Collier's encyclopedia: With bibliography and index. Macmillan Educational.

Cita Chicago (17th ed.)

Halsey, William Darrach, i Bernard Johnston. Collier's Encyclopedia: With Bibliography and Index. New York: Macmillan Educational, 1990.

Cita MLA (9th ed.)

Halsey, William Darrach, i Bernard Johnston. Collier's Encyclopedia: With Bibliography and Index. Macmillan Educational, 1990.