"Morgan, Garrett A.". The Encyclopedia of Cleveland. A joint effort by Case Western University and the Western Reserve Historical Society. February 23, 2005. Retrieved February 11, 2013.
case.edu
Grabowski, John. "Morgan Garrett A."Encyclopedia of Cleveland History. Cleveland OH: Case Western Reserve University. Archived from the original on June 29, 2020. Retrieved July 19, 2020.
"The Cleveland Call & Post". The Encyclopedia of Cleveland History. Case Western Reserve University. Archived from the original on June 7, 2012. Retrieved January 28, 2015.
"22 Men Killed Under Lake Fire"(On-Line Google News Archive). Lawrence Journal-World. Vol. LX. Lawrence, Kansas. July 25, 1916. p. 1. Retrieved October 1, 2013. Note: This source for the tunnel fire makes no mention of Morgan by name, save "The second [rescue expedition] saved one of first rescue expedition"
"Morgan, Garrett A., Sr". Notable Kentucky African Americans Database. University of Kentucky. Archived from the original on December 10, 2018. Retrieved May 27, 2015.
"Morgan, Garrett A., Sr". Notable Kentucky African Americans Database. University of Kentucky. Archived from the original on December 10, 2018. Retrieved May 27, 2015.
"The Cleveland Call & Post". The Encyclopedia of Cleveland History. Case Western Reserve University. Archived from the original on June 7, 2012. Retrieved January 28, 2015.
Grabowski, John. "Morgan Garrett A."Encyclopedia of Cleveland History. Cleveland OH: Case Western Reserve University. Archived from the original on June 29, 2020. Retrieved July 19, 2020.