Singer, Ferdinand L.
New York: Harper and Row, 1975
Buku Teks
Shelley, Joseph F.
McGraw-Hill, 1980
Buku Teks
Hibbeler, R.C.
Pearson - Prentice Hall, 2006
Buku Teks
Huang, T.C.
Addison-Wesley, 1968
Buku Teks
Hibbeler, R.C.
Pearson/Prentice Hall, 2006
Buku Teks