APA

Ringenberg L. A., . (1968). College geometry. New York: John Wiley & Sons.

Chicago

Ringenberg Lawrence A, . 1968. College geometry. New York: John Wiley & Sons.

Harvard

Ringenberg L. A., . (1968). College geometry. New York: John Wiley & Sons.

MLA

Ringenberg Lawrence A, . College geometry. New York: John Wiley & Sons. 1968.