1. Land resources and animal production;Blair Rains,1980
2. The Poultry Industry in Sri Lanka (With Special Reference to Egg Production and Marketing);Chandrasiri,1980
3. The world feed situation;Dale;World Animal Review,1985
4. Agriculture: Toward 2000;Food and Agriculture Organisation,1979
5. A spatial equilibrium model of the livestock feed economy in the United States;Fox;Econometrica,1953