Heinemann, David, author
Terling Paperbacks, 2003
Buku Teks
edited by Robert Chapman and Keith Sinclair
Pauls Book Arcade for the University of Auckland, 1963
Buku Teks
edited by S.A. Wurm and D.C. Laycock
Linguistic Circle of Canberra, 1970
Buku Klasik
Idries Shah
Octagon Press, 1947
Buku Teks
Armstrong, Amatullah, author
Ferozsons, 2001
Buku Referensi