Rathbone, Robert R.
Addison-Wesley Publishing Company, 1985
Buku Teks
Campbell, William Giles
Hoghton Mifflin, 1990
Buku Teks
Saunders, Alta Gwinn
McGraw-Hill, 1940
Buku Teks
Anderson, Chester Reed
McGraw-Hill, 1957
Buku Teks
Weisman, Herman M.
Charles E. Merrill Publishing Company, 1980
Buku Teks