by James D. Ebert ... [and others]
Holt, Rinehart and Winston, 1973
Buku Teks
by Robert J. Brooker ... [and others]
McGraw-Hill, 2008
Buku Teks
Beck, Raymond W., author
Burgess, 1977
Buku Teks
Muzos, Steven J.
Harper Collins College, 1992
Buku Teks
Kimball, John W., author
Erlangga, 1991
Buku Teks