Cita APA (7th ed.)

Johnson, R. W., & Brown, G. M. (1976). Cleaning up Europe's waters: Economics, management and policies. Praeger.

Cita Chicago (17th ed.)

Johnson, Ralph Whitney, i Gardner Mallard Brown. Cleaning Up Europe's Waters: Economics, Management and Policies. New York: Praeger, 1976.

Cita MLA (9th ed.)

Johnson, Ralph Whitney, i Gardner Mallard Brown. Cleaning Up Europe's Waters: Economics, Management and Policies. Praeger, 1976.