Gaya APA

Johnson, D, W., Johnson, R, T. (1975). Learning together and alone : cooperation, competition and individualization . Englewood Cliffs, NJ: Prentice Hall.

Gaya MLA

Johnson, David, W.., Johnson, Roger, T.. "Learning together and alone : cooperation, competition and individualization". Englewood Cliffs, NJ: Prentice Hall, 1975. Text.