APA

Langan J., . (1999). English skills with readings. Boston: McGraw-Hill College.

Chicago

Langan John, . 1999. English skills with readings. Boston: McGraw-Hill College.

Harvard

Langan J., . (1999). English skills with readings. Boston: McGraw-Hill College.

MLA

Langan John, . English skills with readings. Boston: McGraw-Hill College. 1999.