00512nam a2200181Ia 4500 70591 160116s9999||||xx |||||||||||||| ||und|| 9781412981255 PK-LaUMT 001.42 RAV-R RAV-R Ravitch, Sharon M., J.T. Reason & rigor how conceptual frameworks guide research Ravitch, Sharon M., J.T.|Riggan, Matthew Los Angles,USA: Sage, 2012 174 p. EN Riggan, Matthew BK 81641 81641 0 0 0 0 01 01 2015-01-18 5 001.42 RAV-R RAV-R 97524 2019-05-15 00:00:00 2019-05-03 2016-01-18 BK