Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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