APA-referens (7:e uppl.)

Klein, U. Individuation and Classification of Plant Materials around 1800: Ursula Klein. Spaces of classification.(2003).

Chicago-referens (17:e uppl.)

Klein, Ursula. "Individuation and Classification of Plant Materials Around 1800: Ursula Klein." Spaces of Classification.(2003) .

MLA-referens (8:e uppl.)

Klein, Ursula. "Individuation and Classification of Plant Materials Around 1800: Ursula Klein." Spaces of Classification.(2003), .

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