„Hans Christian Mortensen” változatai közötti eltérés

* {{cite journal |author= Preuss, Niels Otto|year=2001 2001|title= Hans Christian Cornelius Mortensen: aspects of his life and of the history of bird ringing|journal= [[Ardea (journal)|Ardea]]|volume= 89|issue= 1|pages= 1–6|url= http://ardeajournal.natuurinfo.nl/ardeapdf/a89-001-006.pdf|accessdate= 2010-02-02|archiveurl= https://web.archive.org/web/20110724161954/http://ardeajournal.natuurinfo.nl/ardeapdf/a89-001-006.pdf|archivedate= 2011-07-24}}