Lua APA (7ú heag.)
Ekholm-Miller, S. (1969). Mound 30a and the early preclassic ceramic sequence of Izapa, Chiapas, Mexico. New World Archaeological Foundation.
Lua i Stíl Chicago (17ú heag.)
Ekholm-Miller, Susanna. Mound 30a and the Early Preclassic Ceramic Sequence of Izapa, Chiapas, Mexico. Provo, Utah: New World Archaeological Foundation, 1969.
Lua MLA (9ú heag.)
Ekholm-Miller, Susanna. Mound 30a and the Early Preclassic Ceramic Sequence of Izapa, Chiapas, Mexico. New World Archaeological Foundation, 1969.
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