Biagi, Shirley
Wadsworth and Cengage Learning, 2012
Buku Teks SO
Byerly, Carolyn M.
Blackwell, 2008
eBooks
Baran, Stanley J.
McGraw-Hill, 2003
Buku Teks SO
Baran, Stanley J.
McGraw-Hill , 2004
Multimedia
Baran, Stanley J.
McGraw-Hill, 2013
Buku Teks SO