[Publisher not identified], 1968
Buku Teks
Keel, Pamela K., author
Pearson/Prentice Hall, 2005
Buku Teks
edited by Craig Donnellan
Independence Educational Publishers, 1994
Buku Teks
Keel, Pamela K., author
Pearson Prentice-Hall, 2005
Buku Teks
Faculty of engineering saitama university,
Majalah, Jurnal, Buletin