Bornemisza Steiner, E., Constenla Umaña, M. A., Alvarado, A., Ortega, J., & Vasquez, J. (1979). Organic Carbon Determination by the Walkley-Black and Dry Combustion Methods in SurfaceSoils and Andept Profiles from Costa Rica.

Bornemisza Steiner, Elemer, Manuel Arturo Constenla Umaña, A. Alvarado, J. Ortega, و J. Vasquez. Organic Carbon Determination By the Walkley-Black and Dry Combustion Methods in SurfaceSoils and Andept Profiles From Costa Rica. 1979.

Bornemisza Steiner, Elemer, et al. Organic Carbon Determination By the Walkley-Black and Dry Combustion Methods in SurfaceSoils and Andept Profiles From Costa Rica. 1979.