Covington, Vicki, author
Penguin Books, 1990
Buku Teks
Churchill, Winston, Sir, 1874-1965, author
Houghton Miffiln, 1948
Buku Teks
Arifin Djauhari, author
Fakultas Teknik Universitas Indonesia, [Date of publication not identified]
UI - Laporan Penelitian
Petrescu, Cezar
Foreign Languages Publishing House, 1957
Buku Teks
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2005
UI - Skripsi (Membership)