Columbia subject headings:
Harvard subject headings:
Ḥakīm, Tawfīq, 1898-1987--Religion.
Idrīs, Yūsuf--Religion.
Islam--20th century
Islam--Apologetic works
Islam--Egypt
Maḥmūd, Zakī Najīb, 1905-1993
Princeton subject headings:
Ḥakīm, Tawfīq--Religion.
Idrīs, Yūsuf--Religion.
Islam--20th century.
Islam--Apologetic works.
Islam--Egypt.
Maḥmūd, Zakī Najīb, 1905-