00323nam a22001337a 4500003000400000005001700004008004100021020001800062040000800080100001600088245003600104250001600140260003300156OSt20190403114340.0190403b        xxu||||| |||| 00| 0 eng d  a0-205-28739-5  cn/a  aJohn Vivian  aThe Media of Mass Communication  a5th edition  aLondonbAllyn and Baonc1998