Stilgoe, John R., 1949, author
The MIT Press, 2015
Buku Teks
Sauter, David, author
Delmar/Cengage Learning, 2011
Buku Teks
edited by Steven Moorhead and Gordon Grice
Rockport Publisher, 1997
Buku Referensi
Jackson, I.J.
Longman Scientific & Technical, 1993
Buku Teks
Martinus Nijhoff, 1985
Buku Teks