1. How long did it take for life to begin and evolve to cyanobacteria;Lazcano;J Mol Evol,1994
2. Timetable of evolutionary history of life, https://en.wikipedia.org/wiki/timetable_of_the_evolutionary_history_of_life.
3. Walsh B. Origins of life, nitro.biosci/Arizona.edu/course/EEB105/lectures/origin_of_life/origins.htm.
4. BBC Nature history of life, www.bbc.co.uk/Nature/History.
5. Earth’s earliest atmospheres;Zahnle;Cold Spring Harbor Perspect Biol,2015