por Rossi, Peter H. (Peter Henry), 1921-2006 [autor] | Freeman, Howard E [autor].
por Davidson, E. Jane [autor].
por Krueger, Richard A [autor] | Patton, Michael Quinn [prologuista].
por Krueger, Richard A [autor].
por Cook, Thomas D [autor] | Reichardt, Charles S | Evaluation Research Society.
por Patton, Michael Quinn [autor].
por Patton, Michael Quinn [autor] | Patton, Michael Quinn. Qualitative evaluation and research methods.