Cite

A map showing the levels of iodine in drinking water in northern China

MLA

A Map Showing the Levels of Iodine in Drinking Water in Northern China. 0AD. https://collections.library.yale.edu/catalog/17067086.

APA, 6th edition

A map showing the levels of iodine in drinking water in northern China. (0 C.E.). [Photographs (AAT)]. https://collections.library.yale.edu/catalog/17067086.