de Gracia, A. G. Q. (2009). Competence in college English (First edition.). Rex Book Store.
Chicagoスタイル(17版)引用形式de Gracia, Alta Grace Q. Competence in College English. First edition. Manila: Rex Book Store, 2009.
MLA(9版)引用形式de Gracia, Alta Grace Q. Competence in College English. First edition. Rex Book Store, 2009.
警告: この引用は必ずしも正確ではありません.