APA Citation

Sitorus, L. (2004). WINDOW ON THE WORLD English for SMA Year 1. Erlangga.

Chicago Style Citation

Sitorus, Lungguk. WINDOW ON THE WORLD English for SMA Year 1. Erlangga, 2004.

MLA Citation

Sitorus, Lungguk. WINDOW ON THE WORLD English for SMA Year 1. Erlangga, 2004.

Warning: These citations may not always be 100% accurate.