(2017). Delta Academic Objectives - Reading Skills B2-C1: Coursebook. Ernst Klett Sprachen GmbH.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रDelta Academic Objectives - Reading Skills B2-C1: Coursebook. Germany: Ernst Klett Sprachen GmbH, 2017.
एमएलए (9वां संस्करण) प्रशस्ति पत्रDelta Academic Objectives - Reading Skills B2-C1: Coursebook. Ernst Klett Sprachen GmbH, 2017.
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