APA (7th ed.) Citation

Robles, R. D., & Estioco, J. C. (2009). Improving grammar skills and more (Revised edition.). Rex Book Store.

Chicago Style (17th ed.) Citation

Robles, Rosemarie D., and Joanalyn C. Estioco. Improving Grammar Skills and More. Revised edition. Manila: Rex Book Store, 2009.

MLA (9th ed.) Citation

Robles, Rosemarie D., and Joanalyn C. Estioco. Improving Grammar Skills and More. Revised edition. Rex Book Store, 2009.