Cita APA

Hurni, H., Eger, H., Fleichhauer, E., El-Swaify, S. A., & Östberg, W. (1996). Precious earth: From soil and water conservation to sustainable land management. Berne, Switzerland: ISCO.

Citación estilo Chicago

Hurni, Hans, Helmut Eger, Eckehard Fleichhauer, Samir A. El-Swaify, y Wilhelm Östberg. Precious Earth: From Soil and Water Conservation to Sustainable Land Management. Berne, Switzerland: ISCO, 1996.

Cita MLA

Hurni, Hans, et al. Precious Earth: From Soil and Water Conservation to Sustainable Land Management. Berne, Switzerland: ISCO, 1996.