Helvering, Commissioner of Internal Revenue, et al. v. Davis. Great Neck Publishing.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHelvering, Commissioner of Internal Revenue, Et Al. V. Davis. Great Neck Publishing.
एमएलए (9वां संस्करण) प्रशस्ति पत्रHelvering, Commissioner of Internal Revenue, Et Al. V. Davis. Great Neck Publishing.
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