Blake, James A., Maciolek, Nancy J. & Meißner, Karin. (2019). Spionidae Grube, 1850.
[book chapter]. pp. 1–103. Chapter 7.4.1 In: Purschke, G., Westheide, W. & Böggemann, M. (Eds.), Handbook of Zoology. Annelida. Band 2. Pleistoannelida, Sedentaria II. De Gruyter, Berlin.