Ballou, M. M. (1890). Due North, or, Glimpses of Scandinavia and Russia. Boston: Houghton Mifflin.
शिकागो स्टाइल उद्धरणBallou, Maturin Murray. Due North, Or, Glimpses of Scandinavia and Russia. Boston: Houghton Mifflin, 1890.
एमएलए उद्धरणBallou, Maturin Murray. Due North, Or, Glimpses of Scandinavia and Russia. Boston: Houghton Mifflin, 1890.
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