APA

Langan J., . (2003). College Writing Skills, Media Edition. Boston: McGraw-Hill.

Chicago

Langan J, . 2003. College Writing Skills, Media Edition. Boston: McGraw-Hill.

Harvard

Langan J., . (2003). College Writing Skills, Media Edition. Boston: McGraw-Hill.

MLA

Langan J, . College Writing Skills, Media Edition. Boston: McGraw-Hill. 2003.