Gaya APA

Walton, C, D. (2007). Geopolitics and the great powers in the 21st century: multipolarity and the revolution in strategic perspective . London: Routledge.

Gaya MLA

Walton, C., Dale. "Geopolitics and the great powers in the 21st century: multipolarity and the revolution in strategic perspective". London: Routledge, 2007. Buku Elektronik.