Cita APA (7th ed.)

(1976). Timber resources of Douglas County, Oregon / Colin D. MacLean.

Cita Chicago (17th ed.)

Timber Resources of Douglas County, Oregon / Colin D. MacLean. 1976.

Cita MLA (9th ed.)

Timber Resources of Douglas County, Oregon / Colin D. MacLean. 1976.

Atenció: Aquestes cites poden no estar 100% correctes.