Siagian, Sondang P., author
Rineka Cipta , 2004
Buku Teks
Siagian, Sondang P., author
Bina Aksara, 1989
Buku Teks
Siagian, Sondang P., author
Rineka Cipta , 1995
Buku Teks
Kurniawaty Yusuf, author
1998
UI - Tesis (Membership)
Arina Restian, author
Universities Muhammadiyah Malang, 2015
Buku Teks