Atwan, Robert, author
McGraw-Hill, 1987
Buku Teks
Young, Felina C., author
IPWI, 1999
Buku Teks
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