APA

Langan J., . (1988). College writing skills. New York: McGraw-Hill.

Chicago

Langan John, . 1988. College writing skills. New York: McGraw-Hill.

Harvard

Langan J., . (1988). College writing skills. New York: McGraw-Hill.

MLA

Langan John, . College writing skills. New York: McGraw-Hill. 1988.