Alalade, O.A., and E.A. Iyayi. “Chemical Composition and the Feeding Value of Azolla (Azolla Pinnata) Meal for Egg-Type Chicks”. International Journal of Poultry Science, vol. 5, no. 2, Jan. 2006, pp. 137–141, https://doi.org/10.3923/ijps.2006.137.141.