Anderson, John G.
Industrial Press, 1983
Buku Teks
Cuito, Aurora, author
Loft, 2001
Buku Referensi
Dallo, Eva, author
daab gmbh, 2005
Buku Referensi
Connelly, James F., author
Macmillan, 1978
Buku Teks
Kramer, Arthur D., author
McGraw-Hill, 1984
Buku Teks