DeGarmo, E. Paul, author
Macmillan Publishing Co., 1979
Buku Teks
DeGaremo, E. Paul
Collier-Macmillan Limited, 1969
Buku Teks
Doyle, Lawrence E., author
Prentice-Hall, 1961
Buku Teks
El Wakil, Sherif D
Prentice-Hall, 1989
Buku Teks
Edgar, Carroll
Addison-Wesley Publishing, 1965
Buku Teks