Peterson, Maurice, author
Constable, 1950
Buku Teks
Sturmthal, Adolf Fox, author
Harvard University , 1964
Buku Teks
Ranke, Leopold von, 1795-1886, author
Roskam, 1944
Buku Teks
Hong, Chung-ok, author
Chang Jak iwa BT pyeong Sa, 1998
Buku Teks
Becker, Carl L. (Carl Lotus), 1873-1945, author
Silver Burdett, 1944
Buku Teks