APA (7 वां संस्करण) प्रशस्ति पत्र
Douglas, J. (1975). Let the earth hear his voice: International congress on world evangelization...... World wide.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र
Douglas, J.D. Let the Earth Hear His Voice: International Congress on World Evangelization...... Minneapolis: World wide, 1975.
एमएलए (9वां संस्करण) प्रशस्ति पत्र
Douglas, J.D. Let the Earth Hear His Voice: International Congress on World Evangelization...... World wide, 1975.
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