Citations: Anonym 1941: [Kahl, P. H. I.] Entomological News , Philadelphia 52, S. 150, B15 10004
Anonym 1941: [Kahl, P. H. I.] Science 93, S. 367
Avinoff, A. 1941: [Kahl, P. H. I.] Annals of the Entomological Society of America, Columbus/Ohio 35, B15 10270, pp. 125
Osborn, H. 1946: Fragments of Entomological History Including Some Personal Recollections of Men and Events. 2 Columbus, Ohio, Published by the Author, 1-232 S., B15: 6024, pp. 93-94, Portr.(Taf. 12)
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. 203, Portr.(Taf. 53)