000 00298nam a2200109Ia 4500
008 220119s9999 xx 000 0 und d
040 _cJayakar Knowledge Resource Centre
100 _aHeath, Douglas H.
245 0 _aMaturity and competence
260 _bGardner Press
_aNew York
_c1977
942 _c1
999 _c377764
_d377764