Cita APA (7a ed.)

Ruddle, K. (1974). The Yukpa cultivation system: A study of shifting cultivation in Colombia and Venezuela. University of California Press.

Cita Chicago Style (17a ed.)

Ruddle, Kenneth. The Yukpa Cultivation System: A Study of Shifting Cultivation in Colombia and Venezuela. Berkeley [etc.]: University of California Press, 1974.

Cita MLA (9a ed.)

Ruddle, Kenneth. The Yukpa Cultivation System: A Study of Shifting Cultivation in Colombia and Venezuela. University of California Press, 1974.