Alfalfa management guide - Undersander, Dan,; Cosgrove, Dennis,; Cullen, Eileen,; Grau, Craig,; Rice, Marlin E.,; Renz, Mark,; Sheaffer, Craig,; Shewmaker, Glen,; Sulc, Mark, (American Society of Agronomy ; Crop Science Society of America ; Soil Science Society of America, 2011)