Weimer, David L., author
Prentice-Hall, 1992
Buku Teks
Weimer, David L., author
Routledge, 2014
Buku Teks
Weimer, David L., author
Pearson Prentice Hall, 1989
Buku Teks SO
Howlett, Michael, author
Oxford University Press, 2009
Buku Teks SO
Kluwer Academic Publishers, 2018
Majalah, Jurnal, Buletin