Bradley, Paul, and Robert Cubey. “A Preliminary Investigation into the Relationship Between Plant Health and Branch Labelling Technique at the Royal Botanic Garden Edinburgh”. Sibbaldia: the International Journal of Botanic Garden Horticulture, no. 9 (October 31, 2011): 179–189. Accessed May 2, 2024. https://journals.rbge.org.uk/rbgesib/article/view/130.