du Preez, L. H., Landman, W. J., Verneau, O., Feldhaar, H., & Schmidt-Rhaesa, A. (2023). Polystome Species of Amphibians. Polystomatid Flatworms : State of Knowledge and Future Trends, 9, 89-420. https://doi.org/10.1007/978-3-031-35887-6_4
Chicago-referens (17:e uppl.)du Preez, Louis H., Willem J. Landman, Olivier Verneau, Heike Feldhaar, och Andreas Schmidt-Rhaesa. "Polystome Species of Amphibians." Polystomatid Flatworms : State of Knowledge and Future Trends 9 (2023): 89-420. https://doi.org/10.1007/978-3-031-35887-6_4.
MLA-referens (9:e uppl.)du Preez, Louis H., et al. "Polystome Species of Amphibians." Polystomatid Flatworms : State of Knowledge and Future Trends, vol. 9, 2023, pp. 89-420, https://doi.org/10.1007/978-3-031-35887-6_4.