1. [Robert Zubin - The Case for Mars](https://www.amazon.co.uk/Case-Mars-Plan-Settle-Planet/dp/145160811X) 2. [How to Live on Mars](https://www.amazon.co.uk/How-Live-Mars-Robert-Zubrin/dp/0307407187/ref=pd_sbs_3/259-0518785-7951826?pd_rd_w=86OuH&pf_rd_p=1469375b-13b4-495f-86c1-e268482be980&pf_rd_r=BPF9JSDN6EMFWF7RXJZF&pd_rd_r=22da6182-57ef-4505-8a49-97ce1a5f9628&pd_rd_wg=rFnbj&pd_rd_i=0307407187&psc=1) 3. [Global Exploration Roadmaps](https://www.nasa.gov/sites/default/files/atoms/files/ger_2018_small_mobile.pdf)