APA (7th ed.) Citation

Petroleum Economist Ltd, TeleGeography, Inc, Baring Securities (Firm), & Schrag, Z. M. (1997). Telecommunications map of the world (2nd ed., Sept. 1997.). Petroleum Economist ; Telegeography.

Chicago Style (17th ed.) Citation

Petroleum Economist Ltd, Inc TeleGeography, Baring Securities (Firm), and Zachary M. Schrag. Telecommunications Map of the World. 2nd ed., Sept. 1997. London : Washington, DC: Petroleum Economist ; Telegeography, 1997.

MLA (9th ed.) Citation

Petroleum Economist Ltd, et al. Telecommunications Map of the World. 2nd ed., Sept. 1997. Petroleum Economist ; Telegeography, 1997.