Bartholomen, Davis
Allyn and Bacon, 1966
Buku Teks
Starr, A.T.
Sir Isaac Pitman & Sons, 1965
Buku Teks
Smith, Arthur Whitmore
McGraw-Hill, 1959
Buku Teks
Gregory, B. A., author
ELBS, 1977
Buku Teks
The Institute of Electrical and Electronics Engineers, Inc., 1982
Buku Referensi