Alveolus diagram in Romanian
<a href="//commons.wikimedia.org/wiki/User:LadyofHats" title="User:LadyofHats">LadyofHats</a>
<a href="//commons.wikimedia.org/wiki/File:Respiratory_system_complete_en.svg" title="File:Respiratory system complete en.svg">Image:Respiratory system complete en.svg</a>