Sawyer, Donald T., author
John Wiley & Sons, 1984
Buku Teks
Sawyer, Donald T., author
John Wiley & Sons, 1994
Buku Teks
Reilley, Charles N.
McGraw-Hill, 1961
Buku Referensi
Sime, Rodney J., author
Saunders College, 1990
Buku Teks
Ewing, Galen W. (Galen Wood), author
McGraw-Hill, 1985
Buku Teks