APA (7th ed.) Citation

Mahmud, S. (1985). A Text Book of Higher Trigonometry (5th ed.). The Ideal Library.

Chicago Style (17th ed.) Citation

Mahmud, Sultan. A Text Book of Higher Trigonometry. 5th ed. Dhaka: The Ideal Library, 1985.

MLA (9th ed.) Citation

Mahmud, Sultan. A Text Book of Higher Trigonometry. 5th ed. The Ideal Library, 1985.