1. Protisty (Protozoa), St. Petersburg, 2000.
2. Ivanov, A.V., Polyanskii, Yu.I., and Strelkov, A.A., Bol’shoi prakticum po zoologii bespozvonochnykh (Large Manual on Invertebrate Zoology), Moscow, 1958.
3. Párducz, B., Rizphysiologische Untersuchungen an Ziliaten. I. Über das Actionssystem von Paramecium, Acta Microbiol. Acad. Sci. Hung., 1954, vol. 1, pp. 175–221.
4. Chen, Y.-T., Studies on the Neuromotor System of Stylonychia postulata and Stylonychia mytilus, J. Morphol., 1944, vol. 75(3), pp. 335–345.
5. Bütschli, O., Protozoa, Vorlesungen uber vergleichenden Anatomie, Berlin, 1910.