S. W. Petters (maio de 1978). «Stratigraphic Evolution of the Benue Trough and Its Implications for the Upper Cretaceous Paleogeography of West Africa». The Journal of Geology. 86 (3): 311–322. Bibcode:1978JG.....86..311P. JSTOR30061985. doi:10.1086/649693
S. W. Petters (maio de 1978). «Stratigraphic Evolution of the Benue Trough and Its Implications for the Upper Cretaceous Paleogeography of West Africa». The Journal of Geology. 86 (3): 311–322. Bibcode:1978JG.....86..311P. JSTOR30061985. doi:10.1086/649693
jstor.org
S. W. Petters (maio de 1978). «Stratigraphic Evolution of the Benue Trough and Its Implications for the Upper Cretaceous Paleogeography of West Africa». The Journal of Geology. 86 (3): 311–322. Bibcode:1978JG.....86..311P. JSTOR30061985. doi:10.1086/649693