del Carmen Rodríguez; Ponciano Ortíz Ceballos; Michael D. Coe; Richard A. Diehl; Stephen D. Houston; Karl A. Taube; Alfredo Delgado Calderón; "Oldest Writing in the New World", in "Science", 15 September 2006: Vol.
del Carmen Rodríguez; Ponciano Ortíz Ceballos; Michael D. Coe; Richard A. Diehl; Stephen D. Houston; Karl A. Taube; Alfredo Delgado Calderón; «Oldest Writing in the New World», in "Science", 15 September 2006: Vol.