Warren, Bill
Routledge , 1998
Buku Teks SO
John Wiley & Sons, 2003
Buku Teks SO
Heidenreich, Charles A.
Brown Book, 1967
Buku Teks SO
Payne, Martin
Sage Publications, 2004
Buku Teks SO
Mayer, John D., 1953-
Scientific American / Farrar, Straus and Giroux, 2014
Buku Teks SO