Valiga, Theresa M., author
Springer, 1997
Buku Teks
Dawson, Paul, author
Routledge, 2005
Buku Teks
Responsive Environments Corporation, 1966
Buku Teks
Markham May, author
McGraw-Hill, 2011
Buku Teks
Barry, Sir Gerald, editoral board
Doubleday, 1965
Buku Referensi