APA (7th ed.) Citation

Johnson, S., & Leon, R. T. (2002). Encyclopedia of bridges and tunnels. Facts On File.

Chicago Style (17th ed.) Citation

Johnson, Stephen, and Roberto T. Leon. Encyclopedia of Bridges and Tunnels. New York: Facts On File, 2002.

MLA (9th ed.) Citation

Johnson, Stephen, and Roberto T. Leon. Encyclopedia of Bridges and Tunnels. Facts On File, 2002.