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New Zealand | |
| Niethe, A. (1969) Mount Somers, The New Zealand Lapidary, September 1969. |
| Carlson, J.R., Rodgers, K.A. (1974) The Coalgate Bentonite. A Ferriferrous-Beidellite Deposit from Canterbury, New Zealand. Clay Minerals: 10: 153-172. |
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USA | |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. Regis, Andrew J. (1978) Mineralogy, Physical, and Exchangeable Chemistry Properties of Bentonites, Denver Service Center (USGS), (February). |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| Special Publication 107 (1990): 9. California Division of Mines and Geology |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| Pemberton, H. Earl (1983) Minerals of California. Van Nostrand Reinhold Company Inc. Van Nostrand Reinholt Press: 440-441. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. Dibblee, T.W., Jr. (1950) Geology of southwestern Santa Barbara County, California, Point Arguello, Lompoc, Point Conception, Los Olivos, and Gaviota Quadrangles, California Division of Mines Bulletin 150: Pl. 3 |