00505pamaa2200169 4500 0000021888 20060502090000.0 0803956630 300.72 YIN 1994 HN29 YIN 1994 YIN Case study research : design and methods Robert K. Yin. Thousand Oaks: Sage Pub., 1994. xvii, 171p.; 22cm. Applied social research methods series Social sciences -- Research -- Methodology Case method