1. Seasonal variation in water quality of the Cross River Nigeria;Akpan;Rev. Hydrobiol. Trop.,1993
2. Ama-Abasi, D.E., 2002. Aspects of population biology of bonga, Ethmalosa fimbriata (Bowdich, 1825) (Clupeidae) in Cross River Estuary, Nigeria. Ph.D. Thesis. University of Calabar, Calabar, 179 pp.
3. Analysis of size composition of bonga, Ethmalosa fimbriata in inner Cross River Estuary, Nigeria;Ama-Abasi;Trans. Nigerian Soc. Biol. Conserv.,2000
4. Length–frequency distribution of Bonga, Ethmalosa fimbriata in Cross River Estuary and adjacent coastal waters;Ama-Abasi;Glob. J. Pure Appl. Sci.,2002
5. Maturation, growth and mortality of clupeids and engraulid stocks in relation to fishing;Beverton;Rapp. P.-v. Reun. CIEM,1963