APA

Ledbetter D. A., . (1968). Elementary college geometry. New York: McGraw-Hill.

Chicago

Ledbetter David A, . 1968. Elementary college geometry. New York: McGraw-Hill.

Harvard

Ledbetter D. A., . (1968). Elementary college geometry. New York: McGraw-Hill.

MLA

Ledbetter David A, . Elementary college geometry. New York: McGraw-Hill. 1968.