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Dyfyniad Arddull ChicagoJakosky, Bruce. The Search for Life on Other Planets. Cambridge: Cambridge university press, 1998.
Dyfyniad MLAJakosky, Bruce. The Search for Life on Other Planets. Cambridge university press, 1998.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.