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harvard.edu
adsabs.harvard.edu
Sahama, Th. G.; Lehtinen, Martti; Rehtijärvi, Pentti (1973). "Natural boehmite single crystals from Ceylon". Contributions to Mineralogy and Petrology. 39 (2): 171. Bibcode:1973CoMP...39..171S. doi:10.1007/BF00375738.
mindat.org
"Boehmite". Mindat with location data. Diakses tanggal 2010-07-10.