APA

Ashton-Warner S., . (1966). Greenstone. New York: Simon and Schuster.

Chicago

Ashton-Warner Sylvia, . 1966. Greenstone. New York: Simon and Schuster.

Harvard

Ashton-Warner S., . (1966). Greenstone. New York: Simon and Schuster.

MLA

Ashton-Warner Sylvia, . Greenstone. New York: Simon and Schuster. 1966.