APA (7th ed.) Citation

Boulter, D., & Darr, D. (1996). North american timber trends study. Naciones Unidas.

Chicago Style (17th ed.) Citation

Boulter, David, and David Darr. North American Timber Trends Study. Nueva York: Naciones Unidas, 1996.

MLA (9th ed.) Citation

Boulter, David, and David Darr. North American Timber Trends Study. Naciones Unidas, 1996.