Humphreys, 1991. Cambridge University Press. Cambridge Document reference Humphreys, L. R., 1991. Tropical pasture utilisation. Cambridge University Press. CambridgeWeb http://books.google.fr/books?hl=fr&lr=&id=hdKkU_4Y8QwCCitation key Humphreys, 1991Datasheets Guatemala grass (Tripsacum andersonii)
