Reference: Wellisch, H. Conrad Gessner (2nd ed.), A 51.1.
Note: A letter addressed to Gaspard Collin. De tulipa Turcarum is the first scientific description of the tulip.
Historical Garden Design Online. Sources from the 16th to the 19th centuries ; 8348 mf. 1 Scanned from microfiche. Original held by: Zentralbibliothek Zürich.