APA (7th ed.) Citation

Hackert, A. F. (1971). Elements of trigonometry. D. C. Heath.

Chicago Style (17th ed.) Citation

Hackert, Albert F. Elements of Trigonometry. Lexington, Mass: D. C. Heath, 1971.

MLA (9th ed.) Citation

Hackert, Albert F. Elements of Trigonometry. D. C. Heath, 1971.

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