2 literature references:

Author: Ndoc, R. and A. Flloko
Year: 1995
Title: Iktiofauna e Shqiperise.
Source: Shtepia botuese "Libri Universitar", Tirana, Albania.
Author: Blanc, M., J.-L. Gaudet, P. Banarescu and J.-C. Hureau
Year: 1971
Title: European inland water fish. A multilingual catalogue.
Source: Fishing News (Books) Ltd., London.