Harris, Forest K.
Wiley Eastern, 1974
Buku Teks
Wolf, Stanley, author
Prentice-Hall, 1983
Buku Referensi
Wolf, Stanley, author
Prentice-Hall, 1983
Buku Referensi
Smith, Arthur Whitmore
McGraw-Hill, 1959
Buku Teks
Kinnard, Isaac F.
John Wiley & Sons, 1956
Buku Teks