Brannan, Bob, author
McGraw-Hill , 2003
Buku Teks
Robinson, Lois
Harper & Row , 1967
Buku Teks
Gerson, Sharon J., 1948-, author
Prentice-Hall, 1992
Buku Teks
Cain, Kathleen Shine, author
Allyn and Bacon , 1994
Buku Teks
Haslam, Sara, author
Routledge, 2009
Buku Teks