Tillery, Bill W.
McGraw-Hill Higher Education, 2007
Buku Teks SO
McCourt, Richard M.
McGraw-Hill, 1990
Buku Referensi
Coughlin, Robert F.
Prentice-Hall, 1968
Buku Referensi
Sandige, Richard S.
McGraw-Hill, 1978
Buku Teks
Kelly, Marylin McGregor
Harper and Row, 1990
Buku Teks SO