Chadwick, H. Spalding's Baseball Guide and Official League Book for 1889.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रChadwick, Henry. Spalding's Baseball Guide and Official League Book for 1889.
एमएलए (9वां संस्करण) प्रशस्ति पत्रChadwick, Henry. Spalding's Baseball Guide and Official League Book for 1889.
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