APA

Gay D., . (1998). Geometry by discovery. New York: John Wiley & Sons.

Chicago

Gay David, . 1998. Geometry by discovery. New York: John Wiley & Sons.

Harvard

Gay D., . (1998). Geometry by discovery. New York: John Wiley & Sons.

MLA

Gay David, . Geometry by discovery. New York: John Wiley & Sons. 1998.