Erasmus Darwin (1825). “The Botanic Garden: A Poem, in Two Parts ... The Economy of Vegetation, and The Loves of the Plants. With Philosophical Notes”, p.7
Erasmus Darwin (1807). “The Botanic Garden: A Poem, in Two Parts: Part I. Containing The Economy of Vegetation. Part II. The Loves of the Plants”, p.117
Erasmus Darwin (1807). “The Botanic Garden: A Poem, in Two Parts: Part I. Containing The Economy of Vegetation. Part II. The Loves of the Plants”, p.22