APA

Highlands A., . (1974). The Dark Horizon. Bucks: Hunt Barnard Printing Ltd.

Chicago

Highlands Alexander, . 1974. The Dark Horizon. Bucks: Hunt Barnard Printing Ltd.

Harvard

Highlands A., . (1974). The Dark Horizon. Bucks: Hunt Barnard Printing Ltd.

MLA

Highlands Alexander, . The Dark Horizon. Bucks: Hunt Barnard Printing Ltd. 1974.