compiled and edited by Bruce Overton
Macmillan, 1938
Buku Referensi
Macmillan, 1994
Buku Referensi
Pollmann, Friedrich, author
Macmillan, 1976
Buku Referensi
Longley, Dennis, author
Macmillan, 1986
Buku Referensi
Wood, Frederick T., author
Macmillan, 1995
Buku Referensi