| 000 | 00335nam a2200121Ia 4500 | ||
|---|---|---|---|
| 001 | 1715 | ||
| 008 | 231023s9999 xx 000 0 und d | ||
| 100 | 1 | _aCampbell, Donald T. | |
| 245 | 1 | 0 | _aDiseños experimentales y cuasiexperimentales en la investigación social |
| 260 |
_aBuenos Aires : Amorrortu, _c1978 |
||
| 999 |
_c43677 _d43677 |
||
| 942 | _n1 | ||
| 942 | _n1 | ||