Stickney, Clyde P.
Harcourt Brace Jovanovich, 1990
Buku Teks
Foulke, Roy Anderson, 1896-
McGraw-Hill, 1968
Buku Teks
Wild, John J.
McGraw-Hill, 2001
Buku Teks
Brown, Lawrence D.
Business Publications, 1987
Buku Teks
Foulke, Roy Anderson, 1896-
McGraw-Hill, 1950
Buku Teks