APA (7th ed.) Citation

ENGELSOHN, H. S. (1981). Trigonometry. McGraw-hill.

Chicago Style (17th ed.) Citation

ENGELSOHN, Harold S. Trigonometry. New York: McGraw-hill, 1981.

MLA (9th ed.) Citation

ENGELSOHN, Harold S. Trigonometry. McGraw-hill, 1981.