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| 1 | Yin, Robert K. Case study research : Design and methods / Robert K. Yin. — Ed. rev. — Newbury Park [etc.] : Sage, [1989]. — 166 p. ; 23 cm. — ( Applied Social Research Methods ; 5) |  | ||
| 2 | Brinkerhoff, Robert O. Productivity measurement : a guide for managers and evaluators / Robert O. Brinkerhoff, Dennis E. Dressler. — California : SAGE Publications, [1990]. — 128 p. ; 22 cm. — ( Applied social research methods ; 19) |  |
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