Artikel Jurnal
Lyons, John, author
Cambridge University Press, 1991
Buku Teks
David B. Guralnik, general editor
The World Publishing Co., 1956
Buku Referensi
Christopher Alexander, Sara Ishikawa, Murray Silverstein, Max Jacobson, Ingrid Fiksdahl-King, Sholomo Angel
Oxford University Press, 1977
Buku Referensi
Curme, George O
Macmillan, 1913
Buku Teks