R. W. J.  Keay, ?Revision of the 'Flora of West Tropical Africa' I?, Kew BulletinKew Bulletin, vol. 1952, pp. 149-157, 1952.

R. W. J.  Keay, ?Revision of the 'Flora of West Tropical Africa' II?, Kew BulletinKew Bulletin, vol. 1952, pp. 543-545, 1953.

R. W. J.  Keay, ?Revision of the 'Flora of West Tropical Africa' III?, Kew BulletinKew Bulletin, vol. 1953, pp. 69-73, 1953.

R. W. J.  Keay, Onochie, C. F. A., and Stanfield, D. P., Nigerian trees, rev. ed. 1. Ibadan: Department of Forest Research, 1964.