S. . A Shehu, M. . L Sonfada, A. . Danmaigoro, A. . A Umar, S. . Akau Hena, and I. . M Wiam, “Kola nut (cola acuminata) extract as a substitute to histological tissue stain eosin”, Sci. J. Vet. Adv., vol. 1, no. 2, pp. 33-37, Aug. 2012.