Davies, J.B. Meredith, author
Baillere Tindall, 1975
Buku Teks
WB. Saunders, 1965
Buku Teks
edited by Edwin D. Kilbourne, Wilson G. Smillie
MacMillan company, 1969
Buku Teks
edited by Muir Gray and Godfrey Fowler
Oxford University Press, 1983
Buku Teks
Leavel, Hugh Rodman, author
McGraw-Hill, 1958
Buku Teks