Gaya APA

Johnson, R, T., Johnson, D, W. (1987). Learning together and alone : cooperative, competitive, and individualistic learning (2nd ed.). Englewood Cliffs, N.J.: Perintice-Hall.

Gaya MLA

Johnson, Roger, T.., Johnson, David, W. "Learning together and alone : cooperative, competitive, and individualistic learning". 2nd ed. Englewood Cliffs, N.J.: Perintice-Hall, 1987. Text.