O`Shaughnessy, Hugh, author
H. Hamilton with The Observer, 1984
Buku Teks
Johansen, Erika, author
Mizan Pustaka, 2016
Buku Teks
Hui, Cang, author
Oxford University Press, 2017
eBooks
Yayasan Wira Bhakti, 1997
Buku Teks
Idenburg, J.
W. De Haan N.V., 1950
Buku Teks