APA

Rossner R. y. o., . (1981). Contemporary american english : student book 4. New York: Macmillian Publishers.

Chicago

Rossner Richard y otros, . 1981. Contemporary american english : student book 4. New York: Macmillian Publishers.

Harvard

Rossner R. y. o., . (1981). Contemporary american english : student book 4. New York: Macmillian Publishers.

MLA

Rossner Richard y otros, . Contemporary american english : student book 4. New York: Macmillian Publishers. 1981.