Iowa State University Veterinarian Records, RS 22/6/0/9, University Archives, Special Collections Department, Iowa State University, http://www.add.lib.iastate.edu/spcl/arch/rgrp/22-6-0-9.html
Dr. M.A. Emmerson retired from his position as professor and chairman of Veterinary Radiology, Department of Veterinary Clinical Sciences in the College of Veterinary Medicine on May 31, 1973 at which time he was named professor emeritus.
"A Tribute to Dr. Mack Allen Emmerson,"
Iowa State University Veterinarian: Vol. 35
, Article 18.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol35/iss3/18