APA (7th ed.) Citation

Camp, S. d. The Fringe of the unknown. Prometheus books.

Chicago Style (17th ed.) Citation

Camp, Sprague de. The Fringe of the Unknown. Prometheus books.

MLA (8th ed.) Citation

Camp, Sprague de. The Fringe of the Unknown. Prometheus books.

Warning: These citations may not always be 100% accurate.