Allen, N. K., & Undercuffler, G. (2010). Happy birthday: The story of the world's most popular song. Pelican.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रAllen, Nancy Kelly, और Gary Undercuffler. Happy Birthday: The Story of the World's Most Popular Song. Gretna, La.: Pelican, 2010.
एमएलए (8वां संस्करण) प्रशस्ति पत्रAllen, Nancy Kelly, और Gary Undercuffler. Happy Birthday: The Story of the World's Most Popular Song. Pelican, 2010.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.