APA

Collier Macmillan Internacional, . (1978). New english 900: Book 4. New York: Collier Macmillan Internacional.

Chicago

Collier Macmillan Internacional, . 1978. New english 900: Book 4. New York: Collier Macmillan Internacional.

Harvard

Collier Macmillan Internacional, . (1978). New english 900: Book 4. New York: Collier Macmillan Internacional.

MLA

Collier Macmillan Internacional, . New english 900: Book 4. New York: Collier Macmillan Internacional. 1978.