Tucker, T.G.
Macmillan, 1923
Buku Teks SO
Murray, Neil, author
Cambridge University Press, 2015
eBooks
Makkink, H.J., author
Nijgh and Van Ditmar, 1951
Buku Teks SO
Kale, M.R., author
Motilal banarsidass publishers private limited, 1992
Buku Referensi
Tucker, Spencer A
Van Nostrand Reinhold, 1982
Buku Teks