Template:Goodfriend, 1986
- Goodfriend, G.A. 1986: Radiation of the land snail genus Sagda (Pulmonata: Sagdidae): comparative morphology, biogeography and ecology of the species of north-central Jamaica. Zoological journal of the Linnean Society 87(4): 367–398. DOI: 10.1111/j.1096-3642.1986.tb01341.x
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