1. Grundzüge eines natürlichen Systems der Mikroorganismen;Casper,1974
2. Alger;Christensen,1966
3. The Classification of Lower Organisms;Copeland,1956
4. On lumpers and splitters of higher taxa in ciliate systematics;Corliss;Trans. Am. Microsc. Soc.,1976
5. The Ciliated Protozoa: Characterization, Classification, and Guide to the Literature;Corliss,1979