Michigan State University. Agricultural Experiment Station. (1998). Michigan field crop ecology: Managing biological processes for productivity and environmental quality. Michigan State University Michigan Agricultural Experiment Station.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रMichigan State University. Agricultural Experiment Station. Michigan Field Crop Ecology: Managing Biological Processes for Productivity and Environmental Quality. [East Lansing, Mich.]: Michigan State University Michigan Agricultural Experiment Station, 1998.
एमएलए (9वां संस्करण) प्रशस्ति पत्रMichigan State University. Agricultural Experiment Station. Michigan Field Crop Ecology: Managing Biological Processes for Productivity and Environmental Quality. Michigan State University Michigan Agricultural Experiment Station, 1998.