APA (7th ed.) Citation

Nelson, A. L., & Folley, K. W. (1956). Plane trigonometry. Harper r Brother.

Chicago Style (17th ed.) Citation

Nelson, Alfred L., and Karl W. Folley. Plane Trigonometry. Harper r Brother, 1956.

MLA (8th ed.) Citation

Nelson, Alfred L., and Karl W. Folley. Plane Trigonometry. Harper r Brother, 1956.

Warning: These citations may not always be 100% accurate.