Thorn, J. (2011). First pitch: How baseball began. Beach Ball Books.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रThorn, John. First Pitch: How Baseball Began. Santa Barbara, Calif.: Beach Ball Books, 2011.
एमएलए (8वां संस्करण) प्रशस्ति पत्रThorn, John. First Pitch: How Baseball Began. Beach Ball Books, 2011.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.