Mapping as a solution?
 Artikel Jurnal
Eagle, Chester
Mapping the paddocks
McPhee Gribble/Penguins Books, 1985
 Buku Teks
Burton, Sharon
Software solutions: concepts and applications
Houghton-Mifflin, 1992
 Buku Teks
Altwaijri, Abdulaziz Othman
Child delinquency: the problem and the solutions
ISESCO , 1997
 Buku Teks
Cutnell, John D.
Physics : student solutions manual
John Wiley & Sons, 2001
 Buku Teks