Cita APA (7a ed.)

Lumabas, R. S. (1980). Plane and spherical trigonometry. Alemar-Phoenix Pub.

Cita Chicago Style (17a ed.)

Lumabas, Rogelio S. Plane and Spherical Trigonometry. Quezon City: Alemar-Phoenix Pub, 1980.

Cita MLA (9a ed.)

Lumabas, Rogelio S. Plane and Spherical Trigonometry. Alemar-Phoenix Pub, 1980.