1. The ecological role of water column microbes in the sea;Azam;Mar. Ecol. Prog. Ser.,1983
2. A molecular phylogenetic investigation of Zoothamnium (Ciliophora, Peritrichia, Sessilida);Clamp;J. Eukaryot. Microbiol.,2006
3. The Ciliated Protozoa: Characterization, Classification and Guide to the Literature;Corliss,1979
4. Ecology of peritrich protozoa;Finley,1969
5. Taxonomische und ökologische Revision der Ciliaten des Saprobiensystems – Band II: Peritrichida, Heterotrichida, Odontostomtida. Informationsberichte des Bayer. Landesamtes Wasserwirtsch. 5/92;Foissner,1992