Pierson, R. H. (1966). The final countdown by Robert H Pierson and G S Stevenson. Pacific Press.
Chicago-čujuhus (17. p.)Pierson, Roberto H. The Final Countdown by Robert H Pierson and G S Stevenson. Pacific Press, 1966.
MLA-čujuhus (9. p.)Pierson, Roberto H. The Final Countdown by Robert H Pierson and G S Stevenson. Pacific Press, 1966.
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