by Mary M. Lay [and others]
Irwin, 1995
Buku Teks
Groneman, Chris H., author
McGraw-Hil, 1966
Buku Teks
International Organizational for Standardization
International Organizational for Standardization, 1999
Buku Teks
Lastrucci, Carlo L.
Schenkman, 1964
Buku Teks
Impact Books, 1993
Buku Referensi