Özbek, Murat, and Suleyman Balik. 2009. “A New Freshwater Amphipod Species, Gammarus Topkarai sp. nov., from Turkey (Amphipoda: Gammaridae), With a Key for Turkish Freshwater Gammarus Species”. Zootaxa 2073 (1). Auckland, New Zealand:45–56. https://doi.org/10.11646/zootaxa.2073.1.4.