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, và 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.