Walter, Eugene Victor, author
Chapel Hill, 1988
Buku Teks
Faculty of the Built Environment, 2006
Majalah, Jurnal, Buletin
Allaby, Michael, author
Macmillan, 1983
Buku Referensi
Artikel Jurnal
edited by Grant S. McClellan
H.W. Wilson Company, 1970
Buku Referensi