Powicke, F. M.
Odhams Press, 1955
Buku Teks
Hall, D.G.E.
London, Hutahinson University Library, (1960)
Buku Teks
Hall, D.G.E., author
University of Pennsylvani Press, 1971
Buku Teks
Hall, D.G.E., author
Hutchinson's University Library, 1950
Buku Teks
Travers, John F.
Scott, Foresman, 1982
Buku Teks