APA

National Cooperative Extension Administration Seminar, National Cooperative Extension Administration Seminar, National Cooperative Extension Administration Seminar, Clark R. C. & Abraham R. H. (1963). La administración en extensión. Rio Piedras, Puerto Rico: Editorial Universitaria de P.R.

Chicago

National Cooperative Extension Administration Seminar, National Cooperative Extension Administration Seminar, National Cooperative Extension Administration Seminar, Clark Robert Crowthers and Abraham Roland H. 1963. La administración en extensión. Rio Piedras, Puerto Rico: Editorial Universitaria de P.R.

Harvard

National Cooperative Extension Administration Seminar, National Cooperative Extension Administration Seminar, National Cooperative Extension Administration Seminar, Clark R. C. and Abraham R. H. (1963). La administración en extensión. Rio Piedras, Puerto Rico: Editorial Universitaria de P.R.

MLA

National Cooperative Extension Administration Seminar, National Cooperative Extension Administration Seminar, National Cooperative Extension Administration Seminar, Clark Robert Crowthers and Abraham Roland H. La administración en extensión. Rio Piedras, Puerto Rico: Editorial Universitaria de P.R. 1963.