Artikel Jurnal
Martin Sardy
Alumni, 1983
Buku Teks
G. Suwardi, author
Universitas Indonesia, 1996
UI - Tesis (Membership)
Saragih, Asiah Janna Sigiro, author
Jakarta : Perpustakaan Nasional RI, 1999,
Buku Referensi
Saragih, Asiah Janna Sigiro, author
Jakarta : Perpustakaan Nasional RI, 1999,
Buku Referensi