Sage Publications, 1988
Buku Teks
Bell, Winifred, author
Macmillan, 1983
Buku Teks
Kirst-Ashman, Karen Kay, author
Cengage Learning , 2017
Buku Teks
Kirst, Ashman Karen Kay, author
Cengage Learning, 2013
Buku Teks
Friedlander, Walter A., author
Prentice Hall of India, 1982
Buku Teks