Whitaker, Carl A.
The roots of psychotherapy
Blakiston, 1953
Buku Teks SO
Rose, Arnold M.
The roots of prejudice
UNESCO, 1951
Buku Teks
Berlin, Isaiah
The Roots of romanticism
Princeton University Press, 2001
Buku Teks SO
America
New York: W.W.Norton & Company, 1988,
Buku Referensi
Cho, Hae-il
America
Dong-su-Munhak-sa, 1990
Buku Teks SO