Anthony, John W.; Bideaux, Richard A.; Bladh, Kenneth W.; Nichols, Monte C. (2005). "Niter"(PDF). Handbook of Mineralogy. Mineral Data Publishing. Retrieved December 28, 2021.
Ericksen, G.E. (1983). "The Chilean Nitrate Deposits: The origin of the Chilean nitrate deposits, which contain a unique group of saline minerals, has provoked lively discussion for more than 100 years". American Scientist. 71 (4): 366–374. JSTOR27852136.