Paucker, P. (1998). Two typographer-calligraphers: Berthold Wolpe and Elizabeth Friedlander.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPaucker, Pauline. Two Typographer-calligraphers: Berthold Wolpe and Elizabeth Friedlander. München, 1998.
एमएलए (8वां संस्करण) प्रशस्ति पत्रPaucker, Pauline. Two Typographer-calligraphers: Berthold Wolpe and Elizabeth Friedlander. 1998.
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