References
NASA (2007) NASA – Microscopic Astronauts [Online]. Available at www.nasa.gov/vision/earth/livingthings/23feb_yeastgap.html (Accessed 24 September 2018).
Amos, J. (2010) ‘Beer microbes live 553 days outside ISS’, BBC News, 23 August [Online]. Available at www.bbc.co.uk/news/science-environment-11039206 (Accessed 24 September 2018).