Robinson, C., & Vũ Tài Hoa Nguyễn văn Phước. (1981). Themes for proficiency with key. Oxford: Oxford University.
シカゴスタイル引用形Robinson, Carole, , Vũ Tài Hoa Nguyễn văn Phước. Themes for Proficiency With Key. Oxford: Oxford University, 1981.
MLA引用形式Robinson, Carole, , Vũ Tài Hoa Nguyễn văn Phước. Themes for Proficiency With Key. Oxford: Oxford University, 1981.
警告: この引用は必ずしも正確ではありません.