Mansell, 1984
Buku Referensi
Routledge, 1993
Buku Referensi
Harter, H. Leon, author
Ohio: American Sciences Press, 1977
Buku Teks
Parker, William, author
The Scarecrow Press, Inc., 1977
Buku Teks
National Engineering Consortium
Professional Education International, 1985
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