A Star is Born – The Life Cycle of a Star: Wikimedia Commons

https://commons.wikimedia.org

This repository provides you with media that either carry a Creative Common's License or are freely available in the public domain. 

MLA citation example:

Magicpiano.  "SalemNH OldLibraryBuilding."  WikiMedia Commons, 19 Sep. 2012. commons.wikimedia.org/wiki/File:SalemNH_OldLibraryBuilding.jpg. Accessed 31 Mar. 2017.