Sawyer, Donald T., author
John Wiley & Sons, 1994
Buku Teks
Sawyer, Donald T., author
John Wiley & Sons, 1984
Buku Teks
Reilley, Charles N.
McGraw-Hill, 1961
Buku Referensi
Sime, Rodney J., author
Saunders College, 1990
Buku Teks
by Hobart H. Willard ... [et al.]
Wadsworth, 1988
Buku Teks