APA

Ashton-Warner S., . (1964). Bell call. New York: Simon and Schuster.

Chicago

Ashton-Warner Sylvia, . 1964. Bell call. New York: Simon and Schuster.

Harvard

Ashton-Warner S., . (1964). Bell call. New York: Simon and Schuster.

MLA

Ashton-Warner Sylvia, . Bell call. New York: Simon and Schuster. 1964.