Gaya APA

Krashen, S, D., Terrell, T, D. (1983). The Natural approach : language acquisition in the classroom . Englewood Cliffs, NJ: Prentice Hall.

Gaya MLA

Krashen, Stephen, D.., Terrell, Tracy, D.. "The Natural approach : language acquisition in the classroom". Englewood Cliffs, NJ: Prentice Hall, 1983. Text.