Gibson, D. I. & Bray, R. A. 1977. The Azygiidae, Hirudinellidae, Ptychogonimidae, Sclerodistomidae and Syncoeliidae of fishes from the north-east Atlantic. Bulletin of the British Museum (Natural History) (Zoology) 32: 167–245.
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Gibson, D. I.; Bray, R. A.
1977
The Azygiidae, Hirudinellidae, Ptychogonimidae, Sclerodistomidae and Syncoeliidae of fishes from the north-east Atlantic
Bulletin of the British Museum (Natural History) (Zoology