Dalrymple, G. Brent (2001). „The age of the Earth in the twentieth century: a problem (mostly) solved”. Special Publications, Geological Society of London. 190 (1): 205—221. Bibcode:2001GSLSP.190..205D. doi:10.1144/GSL.SP.2001.190.01.14.
Dalrymple, G. Brent (2001). „The age of the Earth in the twentieth century: a problem (mostly) solved”. Special Publications, Geological Society of London. 190 (1): 205—221. Bibcode:2001GSLSP.190..205D. doi:10.1144/GSL.SP.2001.190.01.14.