APA (7 वां संस्करण) प्रशस्ति पत्र
Doughty, W. E. (1912). The call of the world: Or, Every man's supreme opportunity. The Presbyterian department of missionary education.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र
Doughty, William E. The Call of the World: Or, Every Man's Supreme Opportunity. New York city: The Presbyterian department of missionary education, 1912.
एमएलए (9वां संस्करण) प्रशस्ति पत्र
Doughty, William E. The Call of the World: Or, Every Man's Supreme Opportunity. The Presbyterian department of missionary education, 1912.
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