Endres, Kirsten W.
Nias Press, 2011
Buku Teks
edited by by Van Nguyen-Marshall, Lisa B. Welch Drummond, Daniele Belanger
Springer, 2012
eBooks
Taylor, Keith Weller.
University of California Press, 1983
Buku Teks
Oxford University Press , 1959
Buku Teks
Routledge, London: Routledge, 1991
Buku Teks