APA

State University. Extension Service, O., State University. Extension, W., States. Dept. of Agriculture, U., of Idaho. Extension, U., Stebbins, R., & Northwest Cooperative Extension, P. (1992). Training pear trees in commercial orchards. : [Corvallis, Or.] : Oregon State University, Extension Service ; [Pullman, Wash.] : Washington State University Extension ; [Moscow, Idaho] : University of Idaho Extension ; [Washington, D.C.] : U.S. Dept. of Agriculture.