Cita APA (7a ed.)

Gacelo, E. P. (2012). Principles of teaching 1. C & E Publishing, Inc.

Cita Chicago Style (17a ed.)

Gacelo, Ester Paunlagui. Principles of Teaching 1. Quezon City: C & E Publishing, Inc, 2012.

Cita MLA (9a ed.)

Gacelo, Ester Paunlagui. Principles of Teaching 1. C & E Publishing, Inc, 2012.