Libes, Susan M.
John Wiley & Sons, 1992
Buku Teks
by V. Ittekkot ... [and others]
Springer-Verlag, 1988
Buku Teks
edited by Jean-Pierre Descy, François Darchambeau and Martin Schmid
Springer, 2012
eBooks
Fakultas Teknik Universitas Indonesia, 2002
UI - Skripsi Membership
Artikel Jurnal