Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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