Attributes / relations provided by
♦ ¹Guild of Frugivores on three fruit-producing tree species Polyscias fulva, Syzyguim guineensis subsp. bamensdae and Pouteria altissima) in Ngel Nyaki Forest Reserve, a Montane Forest Ecosystem in Nigeria, Ihuma Jerome, Hazel Chapman, Tella Iyiola, Akosim Calistus, Stephen Goldson, Journal of Research in Forestry, Wildlife and Environment, Vol. 3, No. 2 (2011)
♦ ²del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona.
♦ ³Seed dispersal by Ceratogymna hornbills in the Dja Reserve, Cameroon, KENNETH D. WHITNEY, MARK K. FOGIEL, AARON M. LAMPERTI, KIMBERLY M. HOLBROOK, DONALD J. STAUFFER, BRITTA DENISE HARDESTY, V. THOMAS PARKER and THOMAS B. SMITH, Journal of Tropical Ecology (1998) 14:351–371