APA (7th ed.) Citation

Spuler, B., Allen, C. G., & Saunders, N. (1977). Rulers and governments of the world. Bowker.

Chicago Style (17th ed.) Citation

Spuler, Bertold, C. G. Allen, and Neil Saunders. Rulers and Governments of the World. London [etc.]: Bowker, 1977.

MLA (9th ed.) Citation

Spuler, Bertold, et al. Rulers and Governments of the World. Bowker, 1977.