Kay, Jackie
Puffin Books, 1996
Buku Teks
Im, Gil-taek, author
Bori, 2007
Buku Teks
Harcourt, Brace & World, Inc., 1941
Buku Teks
Gita Romadhona, author
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2006
UI - Skripsi (Membership)
edited by Susan Hampton and Kate Llewellyn
Penguin Books, 1986
Buku Teks