Fenves, Steven J.
Prentice-Hall, 1969
Buku Teks
Christian, John
John Wiley & Sons, 1981
Buku Teks
Twort, A. C.
Arnold, 1995
Buku Teks
Urquhart, Leonard Church
McGraw-Hill , 1950
Buku Teks
editor-in-chief, Leonard Church Urquhart
McGraw-Hill, 1959
Buku Referensi