Hopkinson, R.G.
Faber and Faber, 1972
Buku Teks
Artikel Jurnal
Alexander, Christopher, author
Oxford University Press, 1977
Buku Referensi
De Chiara, Joseph, 1929-, author
McGraw-Hill, 1980
Buku Referensi
Papadopoulou, Elena V. M., author
[Springer, ], 2012
eBooks