Diacria schmidti occidentalis
- Bleeker, J. and Spoel, S. van der 1988. Diacria piccola and Diacria maculata: two new pteropod mollusc species from the Atlantic and Pacific oceans. Proc. biol. Soc. Wash. 101(1): 60-66, 11 figs.
- Leyen, A. van and Spoel, S. van der 1982. A new taxonomic and zoogeographic interpretation of the Diacria quadridentata group (Pteropoda, Mollusca). Bull. zool. Mus. Univ. Amst. 8 (13): 101-118.
- Spoel, S. van der and Heyman, R. P. 1983. A comparative atlas of zooplankton. Biological patterns in the oceans. Bunge, Utrecht; Springer Verl., Berlin: 1-186.