by Prof. Dr. Sondang P. Siagian, M.P.A
Published by Bumi Aksara
Release year 2004
by Dr. H. Amzah B. Uno, M.Pd
Published by Bumi Aksara
Release year 2007
by M. Linggar Anggoro
Published by Bumi Aksara
Release year 2005
by Dr. Sofyan Syafri Harahap, M.S,Ac
Published by Bumi Aksara
Release year 2002
by Prof. Dr. S. Nasution, M.A.
Published by Bumi Aksara
Release year 2005
by Drs. Daryanto
Published by Bumi Aksara
Release year 2005
by F. Suryatmo
Published by Bumi Aksara
Release year 2005
by Drs. Daryanto
Published by Bumi Aksara
Release year 2006
by M.E. Dicks
Published by Bumi Aksara
Release year 2002
by Drs. Daryanto
Published by Bumi Aksara
Release year 2006
by Drs. Daryanto
Published by Bumi Aksara
Release year 2006
by Drs. Daryanto
Published by Bumi Aksara
Release year 2002
by Keneth Tolt
Published by Bumi Aksara
Release year 1991
by F. Suryatmo
Published by Bumi Aksara
Release year 2004
by F. Suryatmo
Published by Bumi Aksara
Release year 1994