APA (7 वां संस्करण) प्रशस्ति पत्र
Pfenninger, S. E. (2014). Contact, variation, and change in the history of English. John Benjamins Publishing Company.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र
Pfenninger, Simone E. Contact, Variation, and Change in the History of English. Amsterdam, Netherlands: John Benjamins Publishing Company, 2014.
एमएलए (9वां संस्करण) प्रशस्ति पत्र
Pfenninger, Simone E. Contact, Variation, and Change in the History of English. John Benjamins Publishing Company, 2014.
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