Stilp, Richard H.
Delmar Publishers, 1997
Buku Teks SO
Flint, Thos
WB Saunders Company, 1958
Buku Teks
Cashman, John R.
CRC Press, Taylor & Francis Group, 2008
Buku Referensi
Currance, Phillip L., author
Elsevier, 2005
Buku Teks
Dutta, Subijoy, author
McGraw-Hill, 2002
Buku Teks