Democracy and the environment: problems and prospects
edited by William M. Lafferty and James Meadowcroft
Edward Elgar, 1996
 Buku Teks
A Geography of Europe : problems and prospects
edited by George W. Hoffman ; contributors, Christopher Shane Davies ... [and others]
Wiley, 1983
 Buku Teks SO
Downs, Anthony
Urban problems and prospects
Markham Publishing, 1970
 Buku Teks SO
Operation research
Juanda Napitupulu ... [et.al.]
Bagian penerbitan Institut Nasional Malang, 1998
 Buku Teks SO
Sri Mulyono
Operation research
Lembaga Penerbit Fakultas Ekonomi Universitas Indonesia, 1999
 Buku Teks SO