Kelz, H. P. (1978). Language development in Germany: The evolution and standardization of the German language. Institute of National Language.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रKelz, Heinrich P. Language Development in Germany: The Evolution and Standardization of the German Language. Manila: Institute of National Language, 1978.
एमएलए (9वां संस्करण) प्रशस्ति पत्रKelz, Heinrich P. Language Development in Germany: The Evolution and Standardization of the German Language. Institute of National Language, 1978.
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