Bondesen, P. (1950). A comparative morphological-biological analysis of the egg capsules of fresh-water pulmonate gastropods: Hygrophila, Basommatophora, Pulmonata. Naturhistorisk Museum.
Chicago-referens (17:e uppl.)Bondesen, Poul. A Comparative Morphological-biological Analysis of the Egg Capsules of Fresh-water Pulmonate Gastropods: Hygrophila, Basommatophora, Pulmonata. Aarhus: Naturhistorisk Museum, 1950.
MLA-referens (8:e uppl.)Bondesen, Poul. A Comparative Morphological-biological Analysis of the Egg Capsules of Fresh-water Pulmonate Gastropods: Hygrophila, Basommatophora, Pulmonata. Naturhistorisk Museum, 1950.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.