APA

Marsden B., Hopkins A. & Potter J. (1995). Look ahead. Upper Intermediate. Harlow: Longman.

Chicago

Marsden B, Hopkins A and Potter J. 1995. Look ahead. Upper Intermediate. Harlow: Longman.

Harvard

Marsden B., Hopkins A. and Potter J. (1995). Look ahead. Upper Intermediate. Harlow: Longman.

MLA

Marsden B, Hopkins A and Potter J. Look ahead. Upper Intermediate. Harlow: Longman. 1995.