1. Brohmer-Ehrmann-Ulmer: Die Tierwelt Mitteleuropas, Bd. II, Mollusca, Crustacea, Isopoda, Myriapoda. Leipzig: Quelle & Meyer 1937.
2. Bronn, H. G.: Klassen und Ordnungen des Tierreichs, Bd. 3, Mollusca, 2. Buch Pulmonata. Text und Tafeln. 1935.
3. Chitwood, B. G., and M. B. Chitwood: Pathoaphelenchus parietinus (Aphelenchus ormerodis) in the intestin of Philomyscus dorsalis (Slug). J. of Parasitol. 19, 91 (1932).
4. ? Daubaylia potomaca n. sp. a nematode parasit of snails, With a note on other nemas associated With molluscs. Proc. of Helm. 1-5, 8 (1934-1938).
5. An Introduction to Nematology, Sect. I, Teil 1. Baltimore 1937.