Vaile, Roland S.
The Roland Press Company , 1952
Buku Teks
Bearden, William O., author
McGraw-Hill, 2001
Buku Teks
Bearden, William O., author
McGraw-Hill, Irwin, 2007
Buku Teks
Myers, John G., author
Prentice-Hall, 1980
Buku Teks
Lehmann, Donald R., author
McGraw-Hill, 2005
Buku Teks