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
Spring quarter of 1965 marked the beginning of Omega Tau Sigma at Iowa State University. Formal initiation and chartering ceremonies were held on May 22, 1965, in the Memorial Union. National officers and delegates from Ohio State and the University of Illinois officiated at the ceremony.
Iowa State University Veterinarian
"Omega Tau Sigma,"
Iowa State University Veterinarian: Vol. 27
, Article 8.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol27/iss3/8