Bailey, Cyril
Oxford University Press, 1951.
Buku Teks
Azmi Ab Rahman, author
Mind Educate Resources, 2010
Buku Referensi
editor, Linda Komaroff
Brill, 2013
Buku Teks
Sabadini, Irene, editor
Springer, 2012
eBooks
Archer, Geoffrey
Arrow , 2002
Buku Teks