Hannan Arguna Laksmana
Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Indonesia, 2021
UI - Skripsi (Membership)
Karpinski, Andrzej
Polonia Publishing House, 1964
Buku Teks
B. Blackwell for the United Nations Industrial Development Organization, 1991
Buku Teks
essay by Dave Hickey, Peter Plagens
Hudson Hills Press, 1982
Buku Referensi
Richardson, Joanna
The British Council by Longmans, Green, 1960
Buku Teks