BioStor
 | Notes on Propithecus, Indris, and other lemurs (Lemurina) in the British Museum J E Gray (1872) Proc Zool Soc Lond 1872: 846-860 |
 | November 5, 1872 Viscount Walden (1872) Proceedings of The Zoological Society of London 1872: 789-860 |
 | May 20, 1873 E Hamilton (1873) Proceedings of The Zoological Society of London 1873: 472-517 |
 | A checklist of African mammals G M Allen (1939) Bulletin of the Museum of Comparative Zoology, Harvard 83: 1-763 |