Sulfur Information  
[1] What Elements Are Found in the Human Body? Article in the Building Blocks of Life section of the Arizona School of Life Sciences website, last accessed August 2022.

[2] Periodic Table of Elements in the Ocean, article on the Monterey Bay Aquarium Research Institute website, last accessed August 2022.

[3] List of Periodic Table Elements Sorted by Abundance in Earth's Crust, article on the Israel Science and Technology website, last accessed August 2022.

[4] The Composition of the Earth, by William F. McDonough, Chapter 1 in Earthquake Thermodynamics and Phase Transformations in the Earth's Interior, October 2000. Hosted on Google Books; last accessed August 2022.

[5] Solar System Abundances and Condensation Temperatures of the Elements by Katharina Lodders, article published on The Astrophysical Journal website, last accessed August 2022.

[6] Abundance in the Universe of the Elements, article on the PeriodicTable.com website, last accessed August 2022.

[7] Sulfur, by Lori E. Apodaca, United States Geological Survey, Mineral Commodity Summaries, January 2016.

[8] The International Mineralogical Association Database of Mineral Properties, an online database of minerals along with their chemical and physical properties that can be queried and sorted by anyone with internet access.