Publishing, Canberra 2005. 592页. John W. Tunnell, Jean Andrews, Noe C Barrera, Fabio Moretzsohn: Encyclopedia of Texas Seashells: Identification, Ecology
一般認同馬雅的文字系統乃承自奧爾梅克文明(Schele & Freidel,1990;Soustelle,1984),但奧爾梅克人的語言與早先馬雅人的語言的關係仍尚待釐清。 Barrera Vásquez, Alfredo; Juan Ramón Bastarrachea Manzano and William Brito Sansores