APA (7th ed.) Citation

Sloan, G. R., Gray, C. S., & Gray, C. (1999). Geopolitics, geography, and strategy. Frank Cass.

Chicago Style (17th ed.) Citation

Sloan, G. R., Colin S. Gray, and Colin Gray. Geopolitics, Geography, and Strategy. London: Frank Cass, 1999.

MLA (9th ed.) Citation

Sloan, G. R., et al. Geopolitics, Geography, and Strategy. Frank Cass, 1999.