Zitationen: Howard, L. O. 1930: History of applied Entomology (Somewhat Anecdotal). Smithsonian Miscellaneous Collections, Washington 84, S. X+1-564, B15: 1018, pp. (Taf. 25)
Osborn, H. 1952: A Brief History of Entomology Including Time of Demosthenes and Aristotle to Modern Times with over Five Hundred Portraits. Columbus, Ohio, The Spahr & Glenn Company, 1-303 S., B15: 6024a, pp. 230
T. H. S. 1951: In memoriam. Ivar Trägårdh. Norsk entomologisk Tidsskrift, Oslo 8 (4/5), S. 230-231, B15 10458