Hastings, Paul G.
McGraw-Hill, 1974
Buku Teks
Pride, William M.
South Western Cengage Learning, 2012
Buku Teks
Musselman, Vernon A.
Prentice Hall of India, 1982
Buku Teks
Diamond, Jay
Prentice-Hall, 1975
Buku Teks
Musselman, Vernon A.
Prentice-Hal , 1969
Buku Teks