Colorado : Department of English 9105 CampusDelivery Colorado State University
Majalah, Jurnal, Buletin
Engelenhoven, Thomas Pieter Gerrit van
KITLV Press, 2004
Buku Teks SO
Cressey, George Babcock, 1896-1963
J.B. Lippincott, 1960
Buku Teks SO
Kennedy, X.J.
Harper Collins, 1991
Buku Referensi
Jelaluddin Rumi
Kunci Ilmu, 2003
Buku Teks SO