Timewell, C. (2014). Impact of aeroplanes in birds – 100 years ago. Zenodo.
Cita Chicago (17th ed.)Timewell, Chris. Impact of Aeroplanes in Birds – 100 Years Ago. Zenodo, 2014.
Cita MLA (9th ed.)Timewell, Chris. Impact of Aeroplanes in Birds – 100 Years Ago. Zenodo, 2014.
Atenció: Aquestes cites poden no estar 100% correctes.