Riyanto, S. (2004). Gateway English for active communication. Pustaka Pelajar.
Chicago Style (17th ed.) CitationRiyanto, Slamet. Gateway English for Active Communication. Pustaka Pelajar, 2004.
MLA (8th ed.) CitationRiyanto, Slamet. Gateway English for Active Communication. Pustaka Pelajar, 2004.
Warning: These citations may not always be 100% accurate.