1963
Buku Teks
The International Society for Educational Information, 1989
Buku Teks
Sitompul, Marida Christina, author
Universitas Indonesia, 1982
UI - Skripsi (Membership)
Beerling, R.F., author
Balai Pustaka, 1966
Buku Teks
Ajip Rosidi, 1938-, author
Tjupumanik, 1966
Buku Teks