Garrard, Judith, author
Jones & Bartlett Learning, 2011
Buku Teks
Desiana Nurul Maftuhah, author
Universitas Indonesia, 2007
UI - Skripsi (Membership)
edited by Jacqueline A. Kalley, Elna Schoeman, Marlene Burger
University of South Africa, 2005
Buku Teks
Kay Eaton
Dewan Bahasa dan Pustaka, Kementerian Pelajaran Malaysia, 1981
Buku Teks
Aitchison, Jean, 1938-, author
Unesco, 1977
Buku Referensi