American Berkshire association. (1883). The swine breeder's manual. The American Berkshire association.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रAmerican Berkshire association. The Swine Breeder's Manual. Springfield, Ill.: The American Berkshire association, 1883.
एमएलए (9वां संस्करण) प्रशस्ति पत्रAmerican Berkshire association. The Swine Breeder's Manual. The American Berkshire association, 1883.
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