Analysis of information sources in references of the Wikipedia article "Spalding–Rigdon theory of Book of Mormon authorship" in English language version.
Full title: from a verbatim copy of the original now in the Library of Oberlin College, Ohio : including correspondence touching the manuscript, its preservation and transmission until it came into the hands of the publishers
Thus in 1945 the Spaulding theory of the origin of the Book of Mormon was still strongly in vogue, most scholarly works accepting it as the explanation of the origin of the Book of Mormon. Following [Fawn Brodie's] trenchant attack on the theory its popularity quickly declined. Today nobody gives it credence.
Sidney Rigdon's Grandson Says Their Family Understood it to be a Fraud.
Full title: from a verbatim copy of the original now in the Library of Oberlin College, Ohio : including correspondence touching the manuscript, its preservation and transmission until it came into the hands of the publishers