Longman Chesire, 1981
Buku Teks
Kajian Wilayah Eropa, 2005
Majalah, Jurnal, Buletin
Lohrey, Amanda, compiler
Australian Government Publishing Service, 1988
Buku Referensi
CAMBRIDGE UNIVERSITY PRESS,
Majalah, Jurnal, Buletin
State Islamic University (UIN) Sunan Kalijaga, {s.a}
Majalah, Jurnal, Buletin