Vergner, Ivan. “Apparent Competition by Grass Frogs (Rana Temporaria) and Common Toads (Bufo Bufo) for Breeding Sites”. Reptiles & Amphibians 17, no. 2 (June 1, 2010): 82–83. Accessed November 3, 2024. https://journals.ku.edu/reptilesandamphibians/article/view/16081.