Gnagey, W. J. (1972). Learning environments: Readings in educational psychology. Holt, Rinehart and Winstin.
Trích dẫn kiểu ChicagoGnagey, William J. Learning Environments: Readings in Educational Psychology. New York: Holt, Rinehart and Winstin, 1972.
Trích dẫn MLAGnagey, William J. Learning Environments: Readings in Educational Psychology. Holt, Rinehart and Winstin, 1972.
Cảnh báo: Các trích dẫn này có thể không phải lúc nào cũng chính xác 100%.