MacKuen, Michael Bruce
Sage, 1981
Buku Teks
Coombs, Philip H.
Harper & Row, 1964
Buku Teks
Bland, Mark, author
UK Chichester, U.K. Wiley-Blackwell, 2013
Buku Teks
Wong, Yu Jen, author
McGraw-Hill, 1976
Buku Teks
Wiatrowski, Claude A., author
McGraw-Hill, 1980
Buku Teks