Williams & others 2009. Williams, Martin A.J.; Stanley H. Ambrose; Sander van der Kaars; Carsten Ruehlemann; Umesh Chattopadhyaya; Jagannath Pal; Parth R. Chauhan (30 December 2009). "Environmental impact of the 73 ka Toba super-eruption in South Asia". Palaeogeography, Palaeoclimatology, Palaeoecology. 284 (3–4). Elsevier: 295–314. Bibcode:2009PPP...284..295W. doi:10.1016/j.palaeo.2009.10.009.
Williams & others 2009. Williams, Martin A.J.; Stanley H. Ambrose; Sander van der Kaars; Carsten Ruehlemann; Umesh Chattopadhyaya; Jagannath Pal; Parth R. Chauhan (30 December 2009). "Environmental impact of the 73 ka Toba super-eruption in South Asia". Palaeogeography, Palaeoclimatology, Palaeoecology. 284 (3–4). Elsevier: 295–314. Bibcode:2009PPP...284..295W. doi:10.1016/j.palaeo.2009.10.009.