Manual
Diekmann, M.
Diekmann, M.; Sutherland, J.R.; Nowell, D.C.; Morales, Francisco José; Allard, G. (eds.). 2002. Pinus spp. International Plant Genetic Resources Institute (IPGRI), Rome, IT. 90 p. (FAO/IPGRI technical guidelines for the safe movement of germplasm no. 21)