Truchan, Mariola, and Zbigniew Sobisz. “Distribution of Cymbalaria Muralis P. Gaertn., B. Mey. & Scherz. In the Central Part of Polish Pomerania”. Biodiversity: Research and Conservation, no. 1-2, June 2006, pp. 98-101, doi:10.14746/biorc.2006.1-2.22.