2010 Fifa World Cup South Afrika

by Roy P. Sitepu, hadiyansyah, Michael Tobing, Keir Radnedge, Damaring Tyas
Published 2010

Ensiklopedia Astronomi Ruang Angkasa

by Roy P. Sitepu, hadiyansyah, Michael Tobing, Rohmat Haryadi, S.Si
Published 2008

Ensiklopedia Astronomi Sejarah Astronomi

by Roy P. Sitepu, hadiyansyah, Michael Tobing, Rohmat Haryadi, S.Si, Henry Raymond
Published 2008

Ensiklopedia Astronomi Planet

by Roy P. Sitepu, hadiyansyah, Michael Tobing, Rohmat Haryadi, S.Si, Henry Raymond
Published 2008

Ensiklopedia Astronomi Satelit, Asteroid Dan Komet

by Roy P. Sitepu, hadiyansyah, Michael Tobing, Rohmat Haryadi, S.Si, Henry Raymond
Published 2008

Ensiklopedia Astronomi Matahari Dan Bintang

by Roy P. Sitepu, hadiyansyah, Michael Tobing, Rohmat Haryadi, S.Si, Henry Raymond
Published 2008

Ensiklopedia Astronomi Galaksi

by Roy P. Sitepu, hadiyansyah, Michael Tobing, Rohmat Haryadi, S.Si, Henry Raymond
Published 2008

Atlas Sejarah Dunia

by Prof. Jereme Black, Aruminingsing S. Si, Henny Wirawan M. Hum., Psi., Shelomi Angeli S. Hum., Michael Tobing S.Si
Published 2009