1. Encyclopaedia of Religion and Ethics, ed: James Hasting, Vol. 12, Charles Scribner's Sons, New York 1955; Art: Synkretisme.
2. Baker's Dictionary of Christian Ethics, ed: Carl F. H. Henry, Baker Book Hause, Grand Rapid, Michigan, 1973; Art: Synkretisme.
3. Hendrik Kraemer, Religion and Christian Faith, Lutterworth Press, London, 1956, Hal. 385 - 418.
4. W.A. Visser 't Hooft, No Other Name, SCM Press, 1963.
5. Dr. J. Verkuyl, Samakah semua agama, BPK,.Jakarta, 1961.
6. John Hick, God and The Universe of Faiths,
7. Truth and,Dialogue,
8. Christianity and Other Religion,
9. M. Supriadi Sastrosupono, Sinkretisme dan orang Kristen Jawa, Peninjau Th. VIII, No. 1, 2.
10. I Wayan Mastra, Kontekstualisasi Gereja: Jawaban Gereja Protestan di Bali terhadap Injil, Peninjau Th. VI, No. 3 - 4, 1978, hal. 197 - 222.
11. E.G. Singgih, Dari Israel Ke Asia, BPK, Jakarta, 1982.
