Belmonte, Y., Hirtz, P., and Wenger, R., 1965, The salt basins of the Gabon and the Congo (Brazzaville); A tentative palaeogeographic interpretation, in Institute of Petroleum, Salt basins around Africa; Proceedings of a joint meeting of The Institute of Petroleum and The Geological Society, London, March 3, 1965, Proceedings: London, The Institute of Petroleum, p. 55-74.

De Kun, N., 1987, Mineral economics of Africa: New York, Elsevier, 345 p.

Garrett, D.E., 1996, Potash; Deposits, processing, properties and uses: New York, Chapman and Hall, 734 p.

Lambert, R., 1967, Esquisse geologique du bassin potassique Congolais [Geological sketch of the Congolese basin potash]: Annales des Mines, v. 11, p. 709-722.

Martini, J.E.J., and Makanga, J.-F., 2002, Carte metallogenique de la Republique Gabonaise [Metallogenic map of the Republic of Gabon]: Libreville, Gabon, Direction Generale des Mines et de la Geologie, scale 1:1,000,000.

Notholt, A.J.G., 1983, Potash in developing countries, in McKercher, R.M., ed., Potash 83; Potash technology; mining, processing, maintenance, transportation, occupational health and safety, environment: Toronto, Canada, Pergamon Press, p. 29-40.