Cita APA (7th ed.)

Johnson, G. V., & Johnson, R. L. (1990). Economic valuation of natural resources: Issues, theory, and applications. Westview Press.

Cita Chicago (17th ed.)

Johnson, Gary V., i Rebecca L. Johnson. Economic Valuation of Natural Resources: Issues, Theory, and Applications. Boulder: Westview Press, 1990.

Cita MLA (9th ed.)

Johnson, Gary V., i Rebecca L. Johnson. Economic Valuation of Natural Resources: Issues, Theory, and Applications. Westview Press, 1990.