Gaya APA

Swanson, C, P., Hattum, R, J, V. (NULL). Developmental language programming ffor retarded . Boston:: Boston: Allyn And Bacon; 1979.

Gaya MLA

Swanson, Carl, P.., Hattum, Rolland, J., Van. "Developmental language programming ffor retarded". Boston:: Boston: Allyn And Bacon; 1979, NULL. Text.