Wolfgang. (1997). how to easily speak english. Harmoni.
Chicagoスタイル(17版)引用形式Wolfgang. How to Easily Speak English. Jakarta: Harmoni, 1997.
MLA(9版)引用形式Wolfgang. How to Easily Speak English. Harmoni, 1997.
警告: この引用は必ずしも正確ではありません.
APA(7版)引用形式