1. Lee JJ, Leedale GF, Bradbury P, eds. Illustrated Guide to the Protozoa. 2nd ed. Blackwell Publishing, 2005.
2. Fenchel T. Ecology of Protozoa. 2nd ed. Madison: Science Tech, 1987.
3. Paulin JJ, Morphology and cytology of ciliates. In: Hausmann K, Bradbury PC, eds. Ciliates. Cells as organisms. Stuttgart: Gustav Fischer, 1996:1–40.
4. Hausmann K, Hülsmann N, Radek R. Protistology. 3rd ed. Berlin: Schweizerbart’sche Verlagbuchhandlung, 2003.
5. Radek R, Hausmann K. Phagotrophy in ciliates. In: Hausmann K, Bradbury PC, eds. Ciliates. Cells as organisms. Stuttgart: Gustav Fisher, 1996:197–219.