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20. Steinmetz H, Schmidt P, Tina-Booh A, Wieczorek S, Schwartz SH. Testing measurement invariance using multigroup CFA: differences between educational groups in human values measurement. Quality & Quantity: International Journal of Methodology. 2009;43(4):599–616. [
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21. Solano AC, Nader M. La evaluación de los valores humanos con el portrait values questionnaire de Schwartz [Human values assessment with Schwartz’s portrait values questionnaire]. Interdisciplinaria Revista de Psicología y Ciencias Afines. 2006;23(2):155–74. [Spanish]
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