Poe, Edgar Allan (21. 5. 1998). J. Gerald Kennedy, ур. The Narrative of Arthur Gordon Pym of Nantucket and Related Tales. Oxford University Press, UK. ISBN0-19-283771-0.CS1 одржавање: Формат датума (веза) Length 336 pages Quote: "Explanatory Note #254: Poe apparently got the idea for his shrinking chamber from an 1830 Blackwood's story titled the 'Iron Shroud'"
Alterton, Margaret (јун 1933). „An Additional Source for Poe's the Pit and the Pendulum”. Modern Language Notes. 48 (6): 349—356. JSTOR2912531. doi:10.2307/2912531.CS1 одржавање: Формат датума (веза)
Alterton, Margaret (јун 1933). „An Additional Source for Poe's the Pit and the Pendulum”. Modern Language Notes. 48 (6): 349—356. JSTOR2912531. doi:10.2307/2912531.CS1 одржавање: Формат датума (веза)
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Oxford Journals Critique of William Mudford Notes and Queries July 31, 1943 p. 83