APA (7th ed.) Citation

Judd, C. (1966). Outpost Mars (1st Four Square ed.). Four Square Books.

Chicago Style (17th ed.) Citation

Judd, Cyril. Outpost Mars. 1st Four Square ed. London: Four Square Books, 1966.

MLA (8th ed.) Citation

Judd, Cyril. Outpost Mars. 1st Four Square ed. Four Square Books, 1966.