Martin, John H.
Connecticut : Aplleton & Lange, 1989,
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Ross, Michael H.
Harper & Row, 1985
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Martin, John H.
Appleton & Lange, 1989
Buku Teks SO
Gartner, Leslie P.
Lippincott Williams-Wilkins, 2014
Buku Teks SO
Telford, Sam R.
CRC Press, 2009
Buku Referensi