Mortenson, Michael E.
Industrial Press, 1990
Buku Referensi
Hearn, Donald
Prentice-Hall, 1986
Buku Teks SO
Hearn, Donald
Prentice-Hall, 1986
Buku Teks SO
Hill, Francis S.
Macmillan, 1990
Buku Teks SO
Cooke, D.J.
Cambridge Univeristy Press, 1984
Buku Teks SO