Ninkovich, D.; N.J. Shackleton; A.A. Abdel-Monem; J.D. Obradovich; G. Izett (7 December 1978). "K−Ar age of the late Pleistocene eruption of Toba, north Sumatra". Nature. Nature Publishing Group. 276 (5688): 574–577. Bibcode:1978Natur.276..574N. doi:10.1038/276574a0. S2CID4364788.
Acharyya, S.K.; Basu, P.K. (1993). "Toba ash on the South Asia and its implications for correlation of late pleistocene alluvium". Quaternary Research. 40 (1): 10–19. Bibcode:1993QuRes..40...10A. doi:10.1006/qres.1993.1051.
Ninkovich, D.; N.J. Shackleton; A.A. Abdel-Monem; J.D. Obradovich; G. Izett (7 December 1978). "K−Ar age of the late Pleistocene eruption of Toba, north Sumatra". Nature. Nature Publishing Group. 276 (5688): 574–577. Bibcode:1978Natur.276..574N. doi:10.1038/276574a0. S2CID4364788.
Acharyya, S.K.; Basu, P.K. (1993). "Toba ash on the South Asia and its implications for correlation of late pleistocene alluvium". Quaternary Research. 40 (1): 10–19. Bibcode:1993QuRes..40...10A. doi:10.1006/qres.1993.1051.
Ninkovich, D.; N.J. Shackleton; A.A. Abdel-Monem; J.D. Obradovich; G. Izett (7 December 1978). "K−Ar age of the late Pleistocene eruption of Toba, north Sumatra". Nature. Nature Publishing Group. 276 (5688): 574–577. Bibcode:1978Natur.276..574N. doi:10.1038/276574a0. S2CID4364788.
semp.us
"Yellowstone Is a Supervolcano?". Biot Reports. Suburban Emergency Management Project (164). January 11, 2005. คลังข้อมูลเก่าเก็บจากแหล่งเดิมเมื่อ 2008-01-13. สืบค้นเมื่อ 2008-02-21.