APA

Collier Macmillan Internacional, . (1980). New routes to englih: Intermediate skills student book four. New York: Collier Macmillan Internacional.

Chicago

Collier Macmillan Internacional, . 1980. New routes to englih: Intermediate skills student book four. New York: Collier Macmillan Internacional.

Harvard

Collier Macmillan Internacional, . (1980). New routes to englih: Intermediate skills student book four. New York: Collier Macmillan Internacional.

MLA

Collier Macmillan Internacional, . New routes to englih: Intermediate skills student book four. New York: Collier Macmillan Internacional. 1980.