Church, Richard, 1893-1972
Heineman, 1955
Buku Teks
Collinson, Patrick
Clarendon Press, 1982
Buku Teks SO
Kettle, Arnold
Hutchinson University Library , 1972
Buku Teks
Trotter, David
Routledge, 1993
Buku Teks
Saul, Nigel
Oxford University Press, 2017
eBooks