Klein, U. Individuation and Classification of Plant Materials around 1800: Ursula Klein. Spaces of classification.(2003).
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रKlein, Ursula. "Individuation and Classification of Plant Materials Around 1800: Ursula Klein." Spaces of Classification.(2003) .
एमएलए (8वां संस्करण) प्रशस्ति पत्रKlein, Ursula. "Individuation and Classification of Plant Materials Around 1800: Ursula Klein." Spaces of Classification.(2003), .
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