Sturrock, Ford, author
Pitman, 1982
Buku Teks
The Agricultural Development Council, 1972
Buku Teks
Orwell, George, 1903-1950, author
Everyman's Library, 1993
Buku Teks
Arimuladi Setyo Purnomo, author
Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Indonesia, 1987
UI - Skripsi (Membership)
The World Bank Office Jakarta, 2006
Buku Teks