Mark, Darren F.; Renne, Paul R.; Dymock, Ross C.; Smith, Victoria C.; Simon, Justin I.; Morgan, Leah E.; Staff, Richard A.; Ellis, Ben S.; Pearce, Nicholas J. G. (2017-04-01). "High-precision 40Ar/39Ar dating of pleistocene tuffs and temporal anchoring of the Matuyama-Brunhes boundary". Quaternary Geochronology (dalam bahasa Inggris). 39: 1–23. doi:10.1016/j.quageo.2017.01.002. hdl:10023/10236. ISSN1871-1014.
Lumbantobing, Daniel N (2010). "Four New Species of the Rasbora trifasciata-Group (Teleostei: Cyprinidae) from Northwestern Sumatra, Indonesia". Copeia. 2010 (4): 644–70. doi:10.1643/CI-09-155.
Saragih, Bungaran; Sunito, Satyawan (2001). "Lake Toba: Need for an integrated management system". Lakes and Reservoirs: Research and Management. 6 (3): 247–51. doi:10.1046/j.1440-1770.2001.00155.x.
Mark, Darren F.; Renne, Paul R.; Dymock, Ross C.; Smith, Victoria C.; Simon, Justin I.; Morgan, Leah E.; Staff, Richard A.; Ellis, Ben S.; Pearce, Nicholas J. G. (2017-04-01). "High-precision 40Ar/39Ar dating of pleistocene tuffs and temporal anchoring of the Matuyama-Brunhes boundary". Quaternary Geochronology (dalam bahasa Inggris). 39: 1–23. doi:10.1016/j.quageo.2017.01.002. hdl:10023/10236. ISSN1871-1014.
Mark, Darren F.; Renne, Paul R.; Dymock, Ross C.; Smith, Victoria C.; Simon, Justin I.; Morgan, Leah E.; Staff, Richard A.; Ellis, Ben S.; Pearce, Nicholas J. G. (2017-04-01). "High-precision 40Ar/39Ar dating of pleistocene tuffs and temporal anchoring of the Matuyama-Brunhes boundary". Quaternary Geochronology (dalam bahasa Inggris). 39: 1–23. doi:10.1016/j.quageo.2017.01.002. hdl:10023/10236. ISSN1871-1014.