Παραπομπή APA

Blum, W. H., Lal, R., & Valentine, C. (2014). Methods for assessment of soil degredation, advances in soil sciences.

Παραπομπή Chicago Style

Blum, W H., R. Lal, και C. Valentine. Methods for Assessment of Soil Degredation, Advances in Soil Sciences. Bocaraton, C R C Press, 2014.

Παραπομπή MLA

Blum, W H., et al. Methods for Assessment of Soil Degredation, Advances in Soil Sciences. 2014.