Norton, Lin S., author
Routledge, 2009
Buku Teks
Best, John W.
Pearson, 2014
Buku Teks
Best, John W., author
Prentice Hall of India, 1982
Buku Teks
Best, John W., author
Prentice-Hall, 1977
Buku Teks
Hodgson, Naomi, author
West Sussex, UK Wiley Blackwell, 2016
Buku Teks