APA:
Petkov, Nikolai (2003). Ferruginous duck Aythya nyroca breeding population development and habitat selection at Durankulak lake, Bulgaria.
Acrocephalus, letnik 24, številka 118, str. 87-96.
URN:NBN:SI:doc-FT2TSXWC from http://www.dlib.si
MLA:
Petkov, Nikolai. "Ferruginous duck Aythya nyroca breeding population development and habitat selection at Durankulak lake, Bulgaria."
Acrocephalus letnik 24. številka 118 (2003) str. 87-96.
<http://www.dlib.si/?URN=URN:NBN:SI:doc-FT2TSXWC>