APA (7th ed.) Citation

Heidgen, H., McHugh, I., McHugh, F., & Pils, G. (1959). The diamond seeker: The story of John Williamson. Blackie.

Chicago Style (17th ed.) Citation

Heidgen, Heinz, Isabel McHugh, Florence McHugh, and Gottfried Pils. The Diamond Seeker: The Story of John Williamson. London: Blackie, 1959.

MLA (8th ed.) Citation

Heidgen, Heinz, et al. The Diamond Seeker: The Story of John Williamson. Blackie, 1959.