Bernal, Ignacio
Dolphin Books, 1963
Buku Teks
Pellicer, Carlos
Fondo de Cultura Económica, 1978
Buku Teks
Grayson, George W., author
Thomson, 2004
Buku Teks
Pick, James B., author
Westview , 1989
Buku Referensi
Coe, Michael D., author
Thames & Hudson, 2006
Buku Teks