Henni Oktaviani
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 1999
UI - Skripsi (Membership)
Tahkur, Ramesh
Westview Press, 1986
Buku Referensi
edited by Gordon Greenwood and Norman Harper
F.W. Cheshire, 1957
Buku Teks
edited by Gordon Greenwood and Norman Harper
F.W. Chesire, 1968
Buku Teks
by J. Swiericzuk ... [and others]
Pitman, 1980
Buku Teks