00300nam a2200121Ia 4500003000400000008004100004020001300045040000800058100002100066245004600087260003000133300001500163LDD181029s9999    xx            000 0 und d  a23417307  cLDD  aGibson, Robert L 0aIntroduction to guidancecRobert L Gibson  aNew YorkbMacmillanc1981  axvii, 469p