Link, Arthur S., author
Alfred A. Knopf, 1968
Buku Teks
Treue, Wolfgang, author
Inter Nationes, 1969
Buku Teks
Myers, Gustavus, author
Random House, 1943
Buku Teks
Myers, Margaret G., author
Columbia University Press , 1970
Buku Teks
Kemmerer, Donald L., author
Littlefield, Adams, 1956
Buku Teks