APA

Wewalka G., . (1973). Results of the Austrian-Ceylonese Hydrobiological Mission 1970 of the 1st Zoological Institute of the University of Vienna (Austria) and the Department of Zoology of the Vidyalankara university of Ceylon, Kelaniya PART IX: Dytiscidae (Coleoptera). Colombo 15: NARA.

Chicago

Wewalka G, . 1973. Results of the Austrian-Ceylonese Hydrobiological Mission 1970 of the 1st Zoological Institute of the University of Vienna (Austria) and the Department of Zoology of the Vidyalankara university of Ceylon, Kelaniya PART IX: Dytiscidae (Coleoptera). Colombo 15: NARA.

Harvard

Wewalka G., . (1973). Results of the Austrian-Ceylonese Hydrobiological Mission 1970 of the 1st Zoological Institute of the University of Vienna (Austria) and the Department of Zoology of the Vidyalankara university of Ceylon, Kelaniya PART IX: Dytiscidae (Coleoptera). Colombo 15: NARA.

MLA

Wewalka G, . Results of the Austrian-Ceylonese Hydrobiological Mission 1970 of the 1st Zoological Institute of the University of Vienna (Austria) and the Department of Zoology of the Vidyalankara university of Ceylon, Kelaniya PART IX: Dytiscidae (Coleoptera). Colombo 15: NARA. 1973.