Slavin, Albert
Holt Rinehart and Winston, 1972
Buku Teks
Stickney, Clyde P.
Harcourt Brace Jovanovich, 1991
Buku Teks
by Thomas P. Edmonds [and others]
McGraw-Hill, 1997
Buku Teks
Shillinglaw, Gordon
Il. Richard D. Irwin , 1989
Buku Teks
Anderson, W.T.
John Wiley & Sons, 1965
Buku Teks