edited by Benyamin Haggott Beckhart
Columbia Universary Press, 1954, 1956
Buku Teks
Thorne, W.J., author
Oxford University Press , 1948
Buku Teks
Bradford, Frederick A., author
Longmans, Green, 1932
Buku Teks
Lewis, M. K. (Mervyn Keith), author
Philip Allan , 1987
Buku Teks
Halm, George N., author
Richard D. Irwin, 1956
Buku Teks