Gaya APA
Spiegelberg, F.
(1956).
Living religions of the world.
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Englewood Cliffs:
Englewood Cliffs Prentice-Hall.
Gaya MLA
Spiegelberg, Frederic.
"Living religions of the world. ".
Englewood Cliffs:
Englewood Cliffs Prentice-Hall,
1956.
Buku.