Beckman, R.O., author
Harper , 1952
Buku Teks
Cooper, Alfred M., author
McGraw-Hill, 1952
Buku Teks
Reitell, Charles
New York, The Ronald Press Company
Buku Teks
Cerami, Charles A., author
Prentice-Hall, 1957
Buku Teks
Schleh, Edward C., author
McGraw-Hill, 1984
Buku Teks