Rehkamper, M.; Nielsen, Sune G. (2004). "The mass balance of dissolved thallium in the oceans". Marine Chemistry. 85 (3–4): 125–139. doi:10.1016/j.marchem.2003.09.006.
Kemnic, Tyler R.; Coleman, Meghan (14 November 2019). "Thallium Toxicity". National Center for Biotechnology Information (dalam bahasa Inggeris). Dicapai pada 22 April 2020.{{cite web}}: CS1 maint: url-status (link)
Staff of the Nonferrous Metals Division (1972). "Thallium". Minerals yearbook metals, minerals, and fuels. Jil.1. United States Geological Survey. m/s.1358.