APA

Hopkins A., Potter J., . (1997). Look ahead Intermediate. Harlow: Longman.

Chicago

Hopkins A, Potter J, . 1997. Look ahead Intermediate. Harlow: Longman.

Harvard

Hopkins A., Potter J., . (1997). Look ahead Intermediate. Harlow: Longman.

MLA

Hopkins A, Potter J, . Look ahead Intermediate. Harlow: Longman. 1997.