APA (7th ed.) Citation

Ross, M., & Spuler, B. (1977). Rulers and governments of the world. Bowker.

Chicago Style (17th ed.) Citation

Ross, Martha, and Bertold Spuler. Rulers and Governments of the World. London ; New York: Bowker, 1977.

MLA (9th ed.) Citation

Ross, Martha, and Bertold Spuler. Rulers and Governments of the World. Bowker, 1977.

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