1. Dairy Herd Improvement Association. 1991. 1991 Yearbook. Pennsylvania Dairyman's Assoc., New Cumberland.
2. Ernstrom, C. A. 1992. Future of protein and solids pricing systems for milk. Arizona-New Mexico Dairy Newsletter. Coop. Ext. Serv., Univ. Arizona, Tucson; New Mexico State Univ., Las Cruces.
3. US Agricultural Outlook. Staff Rep. 1-92,1992
4. 1990 Pennsylvania dairy farm business analysis. Ext. Circ. 401;Ford,1991
5. Profitability of Jerseys vs Holsteins under component milk pricing;Ford;Jersey J.,1992