-. (2017). Asal Usul Danau Toba. Balai Penerbitan Braille Indonesia (BPPI) Abiyoso.
Chicago Style Citation-. Asal Usul Danau Toba. Balai Penerbitan Braille Indonesia (BPPI) Abiyoso, 2017.
MLA Citation-. Asal Usul Danau Toba. Balai Penerbitan Braille Indonesia (BPPI) Abiyoso, 2017.
Warning: These citations may not always be 100% accurate.