Lowe, G. W. (1975). The early preclassic Barra phase of Altamira, Chiapas: A review with new data. New World Archaeological Foundation, Brigham Young University.
Lua i Stíl Chicago (17ú heag.)Lowe, Gareth W. The Early Preclassic Barra Phase of Altamira, Chiapas: A Review with New Data. Provo, Utah: New World Archaeological Foundation, Brigham Young University, 1975.
Lua MLA (9ú heag.)Lowe, Gareth W. The Early Preclassic Barra Phase of Altamira, Chiapas: A Review with New Data. New World Archaeological Foundation, Brigham Young University, 1975.
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