Sawyer, Donald T.
John Wiley & Sons, 1994
Buku Teks
Reilley, Charles N.
McGraw-Hill, 1961
Buku Referensi
Sime, Rodney J.
Saunders College, 1990
Buku Teks
Ewing, Galen W. (Galen Wood)
McGraw-Hill, 1985
Buku Teks
Willard, Hobart H. (Hobart Hurd), 1881-1974
D. Van Nostrand Company , 1958
Buku Teks