00311nam a2200109Ia 4500008004100000020001800041040003800059100002000097245004500117250000800162260003100170211231s9999    xx            000 0 und d  a0-534-54586-6  cJayakar Knowledge Resource Centre  aSparks, Glenn G 0aMedia effects research: a basic overview  a1st  bWadsworthaAustraliac2002