Witkowski, A. (1979). A taxonomic study on fresh-water sculpins of genus Cottus Linnaeus, 1758 (Cottus gobio L. and Cottus poecilopus Heck.) in Poland. Wydawn. Uniwersytetu Wrocławskiego.
Lua i Stíl Chicago (17ú heag.)Witkowski, Andrzej. A Taxonomic Study on Fresh-water Sculpins of Genus Cottus Linnaeus, 1758 (Cottus Gobio L. and Cottus Poecilopus Heck.) in Poland. Wrocław: Wydawn. Uniwersytetu Wrocławskiego, 1979.
Lua MLA (8ú heag.)Witkowski, Andrzej. A Taxonomic Study on Fresh-water Sculpins of Genus Cottus Linnaeus, 1758 (Cottus Gobio L. and Cottus Poecilopus Heck.) in Poland. Wydawn. Uniwersytetu Wrocławskiego, 1979.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.