U. Ukpabi, K. Amaefule, and O. M. Amaefule, “Performance of Broilers Fed Raw Bambarra Groundnut [Vigna subterranean (L.) Verdc] Offal Diets Supplemented with Lysine and or Methionine”, Int. J. Poult. Sci., vol. 7, no. 12, pp. 1177–1181, Nov. 2008, doi: 10.3923/ijps.2008.1177.1181.