1. ADAS, 1981. The Analysis of Agricultural Materials. Ministry of Agriculture, Fisheries and Food. 2nd ed. Her Majesty's Stationery Office, London.
2. AOAC, 2000. Official Methods of Analysis of AOAC International. 17th edn., (AOAC International, Maryland)
3. Bornstein, S., Plavnik, I. and Lipstein, B., 1982. Evaluation of methanol-grown bacteria and hydrocarbon-grown yeast as sources of protein for poultry: trials with laying birds. British Poultry Science, 23, 487–499.
4. Card, L.E. and Nesheim, M.C., 1972. Poultry Production. 11th edn., (Lea and Febiger, Philadelphia)
5. Daghir, N.J. and Abdul-Baki, T.K., 1977. Yeast protein in broiler rations. Poultry Science, 56, 836–841.