Thorne, W.J.
Oxford University Press , 1948
Buku Teks
Bradford, Frederick A.
Longmans, Green, 1932
Buku Teks
Lewis, Mervyn Keith
Philip Allan , 1987
Buku Teks
Halm, George N.
Richard D. Irwin, 1956
Buku Teks
edited by Allen N. Berger, Philip Molyneux and John O.S. Wilson
Oxford University Press, 2015
Buku Referensi