edited by Wolfgang Stroebe, Miles Hewstone
John Wiley & Sons, 1991
Buku Referensi
London : Sage Publication
Majalah, Jurnal, Buletin
Meyhofer, Dirk, author
Tascen, 1993
Buku Referensi
edited by Anthony Thorlby
Penguin Books, 1969
Buku Referensi
edited by D.R. Rutter, and Lyn Quine
Avebury, 1994
Buku Teks