(2003). Teaching and learning at a distance: Foundations of distance education. Upper Saddle River, N.J: Merrill/Prentice Hall.
Trích dẫn kiểu ChicagoTeaching and Learning At a Distance: Foundations of Distance Education. Upper Saddle River, N.J: Merrill/Prentice Hall, 2003.
Trích dẫn MLATeaching and Learning At a Distance: Foundations of Distance Education. Upper Saddle River, N.J: Merrill/Prentice Hall, 2003.
Cảnh báo: Các trích dẫn này có thể không phải lúc nào cũng chính xác 100%.