Asparagus officinalis References
| 5 | Crawford, M. (2010). Creating a forest garden. Green books. |
| 7 | Crawford, M. (2012). How to grow perennial vegetables: Low-maintenance, low-impact vegetable gardening. Bloomsbury Publishing. |
| 28 | Fleischhauer, S. G., Guthmann, J., & Spiegelberger, R. (2014). Eetbare wilde planten: 200 soorten herkennen en gebruiken. |