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 Elizabeth M. Koppitz
 
 Koppitz, Elizabeth M.; Moreau, Margaret de (1968): A comparison of emotional indicators on human figure drawings of children from Mexico and from the United States [A comparison of emotional indicators on human figure drawings of children from Mexico and from the United States]. R. interam. Psicol. 2(1), 41-48 (eng.). 
 
 Moreau, Margaret de; Koppitz, Elizabeth M. (1968): Relationship between goodenough draw-a-man test IQ scores and Koppitz human figure drawing scores [Relationship between goodenough draw-a-man test IQ scores and Koppitz human figure drawing scores]. R. interam. Psicol. 2(1), 35-40 (eng.).