APA (7th ed.) Citation

Sebastian, E. L., Cayao, E. A., & Asuncion, R. P. (2013). English proficiency 1 (Second edition.). C & E Publishing, Inc.

Chicago Style (17th ed.) Citation

Sebastian, Evelyn L., Erlinda A. Cayao, and Risa P. Asuncion. English Proficiency 1. Second edition. Quezon City: C & E Publishing, Inc, 2013.

MLA (9th ed.) Citation

Sebastian, Evelyn L., et al. English Proficiency 1. Second edition. C & E Publishing, Inc, 2013.