Brandt, Thomas, author
Goasia Verlag, 2001
Buku Referensi
Wilson, John Dover, compiler
University Press, 1926
Buku Teks
edited by Kevin Gilmartin
Cambridge University Press, 2017
Buku Teks
Magnusson, Lynne, author
Cambridge University Press, 2004
eBooks
Stephen, Leslie, 1832-1904, author
University Paperbacks, 1963
Buku Teks