Wolfe, Arthur D., author
John Wiley & Sons, 1984
Buku Teks
Hicks, Herbert G., author
McGraw-Hill Kogakusha, 1974
Buku Teks
Rodgers, William H., author
West Publishing, 1994
Buku Teks
Kubasek, Nancy K., author
Pearson - Prentice Hall, 2005
Buku Teks
Gaba, Jeffrey M., author
United States of America, 1994
Buku Teks