Gaya APA

Johnson, R, T., Johnson, D, W. (1975). Learning together and alone : cooperation, competition, and individualization / David W. Johnson, Roger T. Johnson . New Jersey: Prentice-Hall.

Gaya MLA

Johnson, Roger, T.., Johnson, David, W.. "Learning together and alone : cooperation, competition, and individualization / David W. Johnson, Roger T. Johnson". New Jersey: Prentice-Hall, 1975. Textbook.