Fahrenheit describes, in Latin, these numerical choices in the following paper: Fahrenheit, D. G. (1724). «Experimenta et Observationes de Congelatione aquae in vacuo factae». Philosophical Transactions of the Royal Society. 33 (381–391): 78–84. doi:10.1098/rstl.1724.0016
MacKowiak, Philip A. (1992). «A Critical Appraisal of 98.6°F, the Upper Limit of the Normal Body Temperature, and Other Legacies of Carl Reinhold August Wunderlich». JAMA: The Journal of the American Medical Association. 268 (12): 1578–80. PMID1302471. doi:10.1001/jama.1992.03490120092034
MacKowiak, Philip A. (1992). «A Critical Appraisal of 98.6°F, the Upper Limit of the Normal Body Temperature, and Other Legacies of Carl Reinhold August Wunderlich». JAMA: The Journal of the American Medical Association. 268 (12): 1578–80. PMID1302471. doi:10.1001/jama.1992.03490120092034