00656nam a22002417i 4500 20141212093506.0 940914s1994 sp gr 000 0 spa c eng GEHLERT, S. THE APPLICABILITY OF GENERALIZABILITY THEORY TO SOCIAL WORK RESEARCH AND PRACTICE Instrumentos técnicos Metodología Trabajo social Validez Acción social Documental JOURNAL OF SOCIAL SERVICE RESEARCH Vol. 18, no. 3, 4 (1994), p. 73-88 22 G5 AR 19940914 R.300 AR