Ali, Mohamed bin
The roots of religious extremism: understanding the Salafi Doctrine of Al-WalaŹ¼ wal BaraŹ¼
Imperial College Press, 2016
 Buku Teks SO
Schoub, Barry D.
AIDS & HIV in perspective : a guide to understanding the virus and its consequences / Barry D. Schoub.
The University Press, 1999
 Buku Teks SO
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