APA

Hopkins A., Potter J., . (1998). Look ahead 2. Harlow: Longman.

Chicago

Hopkins A, Potter J, . 1998. Look ahead 2. Harlow: Longman.

Harvard

Hopkins A., Potter J., . (1998). Look ahead 2. Harlow: Longman.

MLA

Hopkins A, Potter J, . Look ahead 2. Harlow: Longman. 1998.