- Pieter van der Borcht (designer), Geeraard Jansen van Kampen (blockcutter), Pear-rooted spurge (Plantin) (Antwerp, Museum Plantin-Moretus) ◼
- Pieter van der Borcht (designer), Geeraard Jansen van Kampen (blockcutter), Pear-rooted spurge. In Pierre Belon, Petri Bellonii Cenomani Plvrimarvm Singvlarivm & memorabilium rerum in Graecia, Asia ... Obseruationes ..., Charles de L'Écluse (Clusius) (translator), Antwerp: Officina Plantiniana (printer), 1589 (Munich, BSB), p. 90 ◼
- Pieter van der Borcht (designer), Geeraard Jansen van Kampen (blockcutter), Pear-rooted Spurge. In Pierre Belon, Plurimarum singularium & memorabilium rerum in Graecia, Asia, Aegypto, Iudaea, Arabia, aliisque exteris prouinciis ab ipso conspectarum observationes, tribus libris expressae, Charles de L'Écluse (Clusius) (translator), Antwerp: Franciscus (II) Raphelengius (printer), Officina Plantiniana (printer), 1605 (Warsaw, MiIZ PAN), p. 43 ◼