APA

Bing R., . (1981). A knight at the opera. New York: Putnam.

Chicago

Bing Rudolf, . 1981. A knight at the opera. New York: Putnam.

Harvard

Bing R., . (1981). A knight at the opera. New York: Putnam.

MLA

Bing Rudolf, . A knight at the opera. New York: Putnam. 1981.