Winslow, Ola Elizabeth
Macmillan Company, 1941
Buku Teks
Swift, Jonathan
Rinehart and Winston , 1959
Buku Teks
Linda Martina, author
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2007
UI - Skripsi (Membership)
essay by Dave Hickey, Peter Plagens
Hudson Hills Press, 1982
Buku Referensi
Richardson, Joanna
The British Council by Longmans, Green, 1960
Buku Teks