Joseph says that he translated the BoM with the Urim and Thummim.

Joseph Smith, Jr. (declarant, Jul 1838) --- Elders' Journal (recorder) · 0.0 yrs after events · Direct

Reference	Joseph Smith in Elders' Journal of the Church of Jesus Christ of Latter Day Saints (July 1838): 43, The Joseph Smith Papers website, accessed August 11, 2021
Date of Account	Jul 1838
Date of Events	Jul 1838
Retrospective Distance	0.0 yrs after events
Hearsay Tier	Direct — Tagged 'Direct'
Point of View	todo
Status	Unreviewed
Source Type	Periodical
Audience	Reading Public

Transcription

I obtained them, and the Urim and Thummim with them; by the means of which, I translated the plates; and thus came the book of Mormon.

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