Burby, William Edward, 1893-, author
West Publishing, 1954
Buku Teks
Burrill, Claude W., author
McGraw-Hill, 1967
Buku Teks
Shenkel, William M., author
McGraw-Hill, 1980
Buku Teks
Shenkel, William M., author
Business Publications , 1980
Buku Teks
Fisher, Ernest McKinley, author
Macmillan, 1923
Buku Teks