Mahmoud, Shah, author
Betterway, 1992
Buku Referensi
Lester, James D.
Scott, Foresman and Company, 1987
Buku Teks
Lester, James D.
Scott, Foresman and Company, 1971
Buku Teks
Laster, James D
Scott, Foresman and Company, 1984
Buku Teks
Coyle, William, author
Wadsworth and Cengage Learning, 2013
Buku Teks