Smith, G. h. (2001). Celsum's challenge: A skeptic's guide... White stone.
Lua i Stíl Chicago (17ú heag.)Smith, Gerald h. Celsum's Challenge: A Skeptic's Guide... anchorage: White stone, 2001.
Lua MLA (9ú heag.)Smith, Gerald h. Celsum's Challenge: A Skeptic's Guide... White stone, 2001.
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