Bishopp, F. C. (Fred Corry), 1884-1970. Fleas as Pests to Man and Animals, With Suggestions for Their Control., pamphlet, 1915; (https://digital.library.unt.edu/ark:/67531/metadc87634/m1/1/: accessed December 13, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .