APA

Bahr L. S. d., Johnston B. e. l., . (19901992). Collier's encyclopedia. New York: Macmillan Educational C.

Chicago

Bahr Lauren S dir, Johnston Bernard ed lit, . 19901992. Collier's encyclopedia. New York: Macmillan Educational C.

Harvard

Bahr L. S. d., Johnston B. e. l., . (19901992). Collier's encyclopedia. New York: Macmillan Educational C.

MLA

Bahr Lauren S dir, Johnston Bernard ed lit, . Collier's encyclopedia. New York: Macmillan Educational C. 19901992.