Kieslich, Klaus, author
John Wiley & Sons, 1976
Buku Referensi
Gert Pickel
VS Verlag, 2012
eBooks
Fabbrini, Federico, author
Oxford University Press, 2014
Buku Teks
Amarjit Singh, editor
Routledge, Taylor & Francis Group, 2017
Buku Teks
edited by Albert H. Yee
Pergamon Press, 1995
Buku Teks