APA (7th ed.) Citation

Riyanto, S. (2004). Gateway English for active communication. Pustaka Pelajar.

Chicago Style (17th ed.) Citation

Riyanto, Slamet. Gateway English for Active Communication. Pustaka Pelajar, 2004.

MLA (8th ed.) Citation

Riyanto, Slamet. Gateway English for Active Communication. Pustaka Pelajar, 2004.

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