Ader, H. J., & Mellenbergh, G. J. (1999). Research methodology in the life, behavioural, and social sciences. SAGE Publications.
Cita Chicago Style (17a ed.)Ader, Herman J., y G. J. Mellenbergh. Research Methodology in the Life, Behavioural, and Social Sciences. London ; Thousand Oaks Calif.: SAGE Publications, 1999.
Cita MLA (9a ed.)Ader, Herman J., y G. J. Mellenbergh. Research Methodology in the Life, Behavioural, and Social Sciences. SAGE Publications, 1999.
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