Yayasan Proklamasi, [date of publication not identified]
Buku Teks
Kornblum, William, author
Wadsworth and Cengage Learning, 2012
Buku Teks
Kornblum, William, author
Harcourt Brace College Publishers, 1997
Buku Teks
Blonna, Rochard, author
McGraw-Hill, 2012
Buku Teks
Alberto Garrido, Helen Ingram, editor
Routledge,, 2011
Buku Teks