Verbatim text: Webb, D. A. and R. J. Gornall. 1989. A Manual of Saxifrages and Their Cultivation. Portland.
Author: Webb, D.A., Gornall, R.J.
Year: 1989
Title: A Manual of Saxifrages and Their Cultivation
PubMed link: http://www.ncbi.nlm.nih.gov/pubmed/17723383