Armstrong, Amatullah, author
Karachi : Ferozsons, 2001
Buku Teks
Kittson, E. Creagh
Milford, 1926
Buku Teks
Artikel Jurnal
Bloomfield, Leonard, author
Holt, Rinehart and Winston, 1961
Buku Teks
Christopher Alexander, Sara Ishikawa, Murray Silverstein, Max Jacobson, Ingrid Fiksdahl-King, Sholomo Angel
Oxford University Press, 1977
Buku Referensi