Aggleton, Peter
London : Churchill Livingstone Inc., 1994,
Buku Referensi
Artikel Jurnal
Fan, Hung
Jones And Bartlett Publishers, 2003
Buku Teks
Harahap, Syaiful W
Pustaka Sinar Harapan, 2000
Buku Teks
edited by Jim McPherson
St. Mark's Canberra, 1988
Buku Teks