1. Cohen, M.M. 2015. First mars habitat architecture. In AIAA SPACE 2015 conference and exposition, p 4517.
2. Collins, C. et al. 1999. Conceptual design of a mars surface Transportation system (MSTS). In 2nd Annual HEDS-UP forum proceedings.
3. Connors, M. et al. 1994. Interviews with the Apollo lunar surface astronauts in support of planning for EVA systems design. Ames Research Center. NASA-TM-108846, 1 Sept 1994.
4. De Haas, H. 2009. Mobility and human development. United Nations Development Programme Human Development Reports Research Paper. http://hdr.undp.org/sites/default/files/hdrp_2009_01_rev.pdf. Accessed 15 Oct 2020.
5. ESA. 2020. Why go to mars? https://www.esa.int/Science_Exploration/Human_and_Robotic_Exploration/Exploration/Why_go_to_Mars. Accessed 15 Oct 2020.