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 | | Kullmann, J. & Wiedmann J. Significance Of Sutures In Phylogeny Of Ammonoidea |
| | Reyment, R.A. The Cretaceous Ammonoidea Of Southern Nigeria And The Southern Cameroons |
| | Spath, L.F. Cretaceous Ammonoidea From Angola, Collected By Professor J. Gregory, D.Sc, F.R.S. Spath, L.F. On Cretaceous Cephalopoda From Zululand |
| www.hgms.org /reference/library-by-author.html (9707 words) |
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