"Planetary Protection Knowledge Gaps for Human Extraterrestrial Missions: Goals and Scope." (2015) Safe on Mars page 37 "Martian biological contamination may occur if astronauts breathe contaminated dust or if they contact material that is introduced into their habitat.
"Planetary Protection Knowledge Gaps for Human Extraterrestrial Missions: Goals and Scope." (2015) ^ Safe on Mars halaman 37 "Kontaminasi biologis Mars dapat terjadi jika para astronot menghirup debu yang terkontaminasi atau jika mereka menyentuh bahan yang ada di habitatnya.