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 Nolan E. Penn
 
 Segalman, Ralph; Penn, Nolan E. (1982): Symbolic interaction and "social pathology": An alternate explanation of behavior [Symbolic interaction and "social pathology": An alternate explanation of behavior]. R. interam. Psicol. 16(1), 33-46 (eng.). 
 
 Penn, Nolan E.; Mettel, Theresa DeLemos; Penn, Barbara P. (1980): A study of need profiles: Brazilians and North Americans [A study of need profiles: Brazilians and North Americans]. R. interam. Psicol. 14(2), 151-160 (eng.).