by FJ. Roethlisberger
Published by PT. Rineka Cipta
Release year 1979

by Drs. Muchdarsyah Sinungan
Published by PT. Rineka Cipta
Release year 1993

by Drs. Muchdarsyah Sinungan
Published by Bumi Aksara
Release year 2000

by Ir. Irianto Aritonang
Published by Media Pressindo
Release year 2004

by Drs. Marcel Go, M.S
Published by PT. Rineka Cipta
Release year 1992

by Thomas Cain
Published by PT. Rineka Cipta
Release year 1994

by Drs. R. Martino
Published by PT. Rineka Cipta
Release year 1993

by Prof. Dr. Sondang P. Siagian, M.P.A
Published by Bumi Aksara
Release year 2004

by Drs. Zulkifli Amsyah, MLS
Published by PT. Gramedia Pustaka Utama
Release year 0

by Drs. Basir Barthos
Published by Bumi Aksara
Release year 2005