Columbia subject headings:
Harvard subject headings:
Ahmadiyya.
Babism.
Bahai Faith.
Communism.
Freemasons.
Islam--20th century
Islam--Apologetic works
Islam--Relations
Princeton subject headings:
Ahmadiyya.
Babism.
Bahai Faith.
Communism.
Freemasons.
Islam--20th century.
Islam--Relations.