درباره سخت دوستان روی زمین و جستجوی حیات در فراسوی زمین:
• "Life at the Limits: Organisms in Extreme Environments" by David A. Wharton
• "The Search for Life on Mars" by Elizabeth Howell and Nicholas Booth
• "Astrobiology: A Very Short Introduction" by David C. Catling
• "Extreme Life: Life in the World's Most Extreme Environments" by Michael Tennesen
• "The Eerie Silence: Renewing Our Search for Alien Intelligence" by Paul Davies
• "Life in the Universe: A Beginner's Guide" by Lewis Dartnell
• in extreme environments on Earth and the search for life on other planets.
• "Planets and Life: The Emerging Science of Astrobiology" edited by Woodruff T. Sullivan III and John A. Baross
• "The Limits of Organic Life in Planetary Systems" by the National Research Council
• "We Are Not Alone: Why We Have Already Found Extraterrestrial Life" by Dirk Schulze-Makuch and David Darling
• "Astrobiology: Understanding Life in the Universe" by Charles S. Cockell
در رابطه با معادله دیراک و بررسی احتمالاتیِ حضور حیات در عالم:
• "The Drake Equation: Estimating the Prevalence of Extraterrestrial Life through the Ages" by Douglas A. Vakoch and Matthew F. Dowd