Ethics & Planetary Protection

1. J. Baird Callicott, Moral Considerability and Extraterrestrial Life, Moral Expertise, ed. D. MacNiven p. ## (London: Routledge, 1990)
   
   
2. Robert Haynes, Ecopoiesis: Playing God On Mars, Moral Expertise, ed. D. MacNiven 177 (London: Routledge, 1990)
   
   
3. Christopher P. McKay, Does Mars Have Rights? Moral Expertise, p. ## (ed. D. MacNiven, 1990)
   
   
4. Alan Marshall, Ethics and the Extraterrestrial Environment, 10 Journal of Applied Philosophy 227 (1993)
   
   
5. Mark L. Lupisella, The Rights of Martians, Space Policy Journal (in press 1997).

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