Cita APA (7th ed.)

Carpio, R. C., & Encarnacion, A. M. (1981). Effective speaking. Rex Book Store.

Cita Chicago (17th ed.)

Carpio, Rustica C., i Anacleta M. Encarnacion. Effective Speaking. Manila: Rex Book Store, 1981.

Cita MLA (9th ed.)

Carpio, Rustica C., i Anacleta M. Encarnacion. Effective Speaking. Rex Book Store, 1981.