1988
“The Dehesa: An Agrosilvopastoral System Of The Mediterranean Region With Special Reference To The Sierra Morena Area Of Spain”. Agroforestry Systems 6 (1-3): 71-96. doi:10.1007/BF02344747. https://doi.org/10.1007/BF02344747.
. 1988. 1973
“Portulacaria Afra Jacq.: A Potential Browse Plant”. Economic Botany 27 (4): 413-416. http://www.jstor.org/stable/4253450.
. 1973.