@MANUAL {DAVID:2004, title = {Farmer field schools: a revolution in training for sustainable cocoa production}, author = {David, S. }, year = {2004}, note = {Cocoa; Tree Crops; Tree Crops On Farm Training; Cocoa On Farm Training; Learning Material; Poster presented at a symposium on Theobroma cacao: ancient crop, medicinal plant, surprising future, at the National Academy of Science, 10 February 2004, Washington DC, USA}, }