edited by Michael Hitchcock
Nias Press, 2010
Buku Teks
Michael Hitchcock, Victor T. King, Michael Parnwell
Nias Press, 2009
Buku Teks
edited by Wendu Nuryanti
Gadjah Mada University Press, 1997
Buku Referensi
Prentice, Richard, author
Routledge, 1993
Buku Teks
Boniface, Priscilla, author
Routledge, 1993
Buku Teks