Piper 1976, Geological and Geophysical implications, p. 478 Piper, J. D. A. (1976). "Palaeomagnetic Evidence for a Proterozoic Super-Continent". Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences. 280 (1298): 469–90. Bibcode:1976RSPTA.280..469P. doi:10.1098/rsta.1976.0007. JSTOR74572. S2CID119465623.
Powell 1995, p. 1053 Powell, C. McA. (1995). "Are Neoproterozoic glacial deposits preserved on the margins of Laurentia related to the fragmentation of two supercontinents? Comment". Geology. 23 (11): 1053–55. doi:10.1130/0091-7613(1995)023<1053:ANGDPO>2.3.CO;2.
Piper 1976, Geological and Geophysical implications, p. 478 Piper, J. D. A. (1976). "Palaeomagnetic Evidence for a Proterozoic Super-Continent". Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences. 280 (1298): 469–90. Bibcode:1976RSPTA.280..469P. doi:10.1098/rsta.1976.0007. JSTOR74572. S2CID119465623.
Piper 1976, Geological and Geophysical implications, p. 478 Piper, J. D. A. (1976). "Palaeomagnetic Evidence for a Proterozoic Super-Continent". Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences. 280 (1298): 469–90. Bibcode:1976RSPTA.280..469P. doi:10.1098/rsta.1976.0007. JSTOR74572. S2CID119465623.
Piper 1976, Geological and Geophysical implications, p. 478 Piper, J. D. A. (1976). "Palaeomagnetic Evidence for a Proterozoic Super-Continent". Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences. 280 (1298): 469–90. Bibcode:1976RSPTA.280..469P. doi:10.1098/rsta.1976.0007. JSTOR74572. S2CID119465623.