Proctor, Charles
Oxford University Press, 2015
Buku Teks
edited by Benyamin Haggott Beckhart
Columbia Universary Press, 1954, 1956
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
Holden, J. Milnes
Sir Isaac Pitman & Sons, 1960
Buku Teks