APA

Staple G. C., Schrag Z. M., Petroleum Economist, Schrag Z. M. & Petroleum Economist. (2001). Telecomunications map of the world. London: Petroleum Economist.

Chicago

Staple Gregory C, Schrag Zachary M, Petroleum Economist, Schrag Zachary M and Petroleum Economist. 2001. Telecomunications map of the world. London: Petroleum Economist.

Harvard

Staple G. C., Schrag Z. M., Petroleum Economist, Schrag Z. M. and Petroleum Economist. (2001). Telecomunications map of the world. London: Petroleum Economist.

MLA

Staple Gregory C, Schrag Zachary M, Petroleum Economist, Schrag Zachary M and Petroleum Economist. Telecomunications map of the world. London: Petroleum Economist. 2001.