Bernstein, Ruth, author
Harcourt Brace Jovanovich, 1982
Buku Teks
Muzos, Steven J.
Harper Collins College, 1992
Buku Teks
Ricki Lewis ... [and others]
McGraw-HIll, 2002
Buku Teks
Belk, Collen
Pearson - Benjamin Cummings, 2008
Buku Teks
Presson, Joelle, author
McGraw-Hill, 2008
Buku Teks