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Loveridge, A. (1938).  On a collection of reptiles and amphibians from Liberia. Proceedings of the New England Zoölogical Club. XVII, 49-74.
Schilthuis, L. (1889).  On a small collection of Amphibia from the Congo with description of a new species.. Tijdschrift der Nederlandsche Dierkundige Vereeniging. Serie 2, . 2, 285-286.
Loveridge, A. (1955).  On Amphibia Salientia from Ivory Coast. Revue Suisse de Zoologie. 62, 129-150.
Hewitt, J. (1933).  On new and rare frogs from Chirinda Forest.. Occasional Papers of the National Museum of Southern Rhodesia. 6(12), 
Bush, S. F. (1952).  On Rana umbraculata, a new frog from South Africa.. Annals of the Natal Museum . 12(2), 153-164, pls 3-6.
Loveridge, A. (1951).  On reptiles and amphibians from Tanganyika Territory collected by C.J.P. Ionides. Bulletin of the Museum of Comparative Zoology. 106(4), 177-204.
Lanza, B. (1978).  On some new or interesting East African amphibians and reptiles. Monitore Zoologico Italiano. Nuova Serie, Supplemento. Firenze. 10, 229-297.
Hewitt, J. (1925).  On some new species of reptiles and amphibians from South Africa.. Record of the Albany Museum. Grahamstown. 3, 343-368.
Cope, E. D. (1867).  On the families of the raniform Anura. Journal of the Academy of Natural Sciences of Philadelphia. Series 2, 6, 189-206.
Kukenthal, W. (1912).  On the hair-like appendages in the frog Astylosternus robustus (Blgr). Bulletin of the Museum of Comparative Zoology. 53(9), 371-377.  Download: Kükenthal_1912.pdf (1.92 MB)
Power, J. H. (1927).  On the herpetological fauna of the Lobatsi-Linokana area.. Transactions of the Royal Society of South Africa. 14, 405-422.
Boycott, R. C. (1982).  On the taxonomic status of Heleophryne regis Hewitt, 1909 (Anura: Leptodactylidae). Annals of the Cape Provincial Museums (Natural History). 14(3), 89-108.