Pennsylvania State University. Office for Distance Education & American Center for the Study of Distance Education. (1987). The American journal of distance education. Office for Distance Education of the College of Education at the Pennsylvania State University.
Trích dẫn kiểu Chicago (xuất bản lần thứ 7)Pennsylvania State University. Office for Distance Education và American Center for the Study of Distance Education. The American Journal of Distance Education. University Park, PA: Office for Distance Education of the College of Education at the Pennsylvania State University, 1987.
Trích dẫn kiểu MLA (xuất bản lần thứ 9)Pennsylvania State University. Office for Distance Education và American Center for the Study of Distance Education. The American Journal of Distance Education. Office for Distance Education of the College of Education at the Pennsylvania State University, 1987.