Ari Nugraha
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2003
UI - Skripsi Membership
Swisher, Carl Brent
University of Chicago Press, 1946
Buku Teks
Leech, Clifford
Grove Press, 1963
Buku Teks
Bobbs-Merril, 1956
Buku Teks
Berlin, Normand
Macmillan Education, 1988
Buku Teks