Furness, Edna L.
Appleton Century , 1964
Buku Teks
Pratley, Rhiannedd
London BBC Books 1988
Buku Teks
Ravid, Dorit Diskin
Springer, 2012
eBooks
Kroes, H.W.J., author
G. B. Van Goor Zonen, 1928
Buku Referensi
Verdam, J., author
Martinus Nijhoff, 1932
Buku Referensi