Siahaan, B. (2009). Proyek Asahan menantang badai demi hari depan. Kempala Foundation.
Chicago Style (17th ed.) CitationSiahaan, Bisuk. Proyek Asahan Menantang Badai Demi Hari Depan. Kempala Foundation, 2009.
MLA (8th ed.) CitationSiahaan, Bisuk. Proyek Asahan Menantang Badai Demi Hari Depan. Kempala Foundation, 2009.
Warning: These citations may not always be 100% accurate.