Valuska, D. L., & Donner, W. W. The past and future of the Pennsylvania German language: Mmany ways of speaking German; many ways of being American / David L. Valuska. William W. Donner. Globalization and the future of German : with a select bibliography.(2004).
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रValuska, David L., और William W. Donner. "The Past and Future of the Pennsylvania German Language: Mmany Ways of Speaking German; Many Ways of Being American / David L. Valuska. William W. Donner." Globalization and the Future of German : With a Select Bibliography.(2004) .
एमएलए (8वां संस्करण) प्रशस्ति पत्रValuska, David L., और William W. Donner. "The Past and Future of the Pennsylvania German Language: Mmany Ways of Speaking German; Many Ways of Being American / David L. Valuska. William W. Donner." Globalization and the Future of German : With a Select Bibliography.(2004), .