APA

State University. Extension Service, O., State University. Extension, W., of Idaho. Cooperative Extension Service, U., Stebbins, R., & States. Dept. of Agriculture, U. (1976). Training and pruning apple and pear trees [1976]. : Corvallis, Or. : Oregon State University Extension Service ; Pullman, Wash. : Washington State University Extension ; Moscow, Idaho : University of Id.