Klein, U. Individuation and Classification of Plant Materials around 1800: Ursula Klein. Spaces of classification.(2003).
Chicago-Zitierstil (17. Ausg.)Klein, Ursula. "Individuation and Classification of Plant Materials Around 1800: Ursula Klein." Spaces of Classification.(2003) .
MLA-Zitierstil (8. Ausg.)Klein, Ursula. "Individuation and Classification of Plant Materials Around 1800: Ursula Klein." Spaces of Classification.(2003), .
警告：这些引文格式不一定是100％准确.