Butterworth-Heinemann, 1993
Buku Teks
Sobti, R.C., author
CRC Press, Taylor & Francis Group, 2009
Buku Teks
edited by Martin Fransman, Gerd Junne and Annemieke Roobeek
Blackwell, 1995
Buku Teks
Barnum, Susan R., author
Wadsworth, 1998
Buku Teks
Wiley-VCH, 2004
Buku Teks