Pilgrim, Mary Alice Gunn. Relationships among Guilford-Zimmerman Temperament Survey Profile, Choice of Field of Study in Business and Academic Performance of Upperclassmen in Business Administration, dissertation, August 1965; (https://digital.library.unt.edu/ark:/67531/metadc164215/m1/1/: accessed October 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .