S. Jocelyn Bell Burnell (1977). „Little Green Men, White Dwarfs or Pulsars?”. Cosmic Search Magazine. Приступљено 2008-01-30. (after-dinner speech with the title of Petit Four given at the Eighth Texas Symposium on Relativistic Astrophysics; first published in Annals of the New York Academy of Science, vol. 302, pp. 685–689, Dec. 1977).