Cambridge University Press, 1997
eBooks
Allwood, Jens
Cambridge University Press, 1995
Buku Teks
Ewing, J.H., editor
World Books1988,
Buku Teks
Delia Yosephine Dipasto, author
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2013
UI - Skripsi (Membership)
edited by Palle Yourgrau
Oxford University Press, 1990
Buku Teks