The below is from this website https://www.lds.org/topics/book-of-mormon-translation?lang=eng
3 Joseph Smith scribes each give a different account of how "The Book of Mormon" was written. Truth is, Joseph copied it entirely from other sources entirely on his own. No one else was with him. He copied the book "View of the Hebrews" published 6 years earlier, a local preacher's writings (Ethan Smith), his father's diary of dreams, and the Bible directly (mispuncuations and all)
Found here .. http://20truths.info/mormon/plagiarism.html
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The scribes who assisted with the translation unquestionably believed that Joseph translated by divine power. Joseph’s wife Emma explained that she “frequently wrote day after day” at a small table in their house in Harmony, Pennsylvania. She described Joseph “sitting with his face buried in his hat, with the stone in it, and dictating hour after hour with nothing between us.”28 According to Emma, the plates “often lay on the table without any attempt at concealment, wrapped in a small linen table cloth.” When asked if Joseph had dictated from the Bible or from a manuscript he had prepared earlier, Emma flatly denied those possibilities: “He had neither manuscript nor book to read from.” Emma told her son Joseph Smith III, “The Book of Mormon is of divine authenticity—I have not the slightest doubt of it. I am satisfied that no man could have dictated the writing of the manuscripts unless he was inspired; for, when acting as his scribe, your father would dictate to me for hour after hour; and when returning after meals, or after interruptions, he would at once begin where he had left off, without either seeing the manuscript or having any portion of it read to him.”29
Another scribe, Martin Harris sat across the table from Joseph Smith and wrote down the words Joseph dictated. Harris later related that as Joseph used the seer stone to translate, sentences appeared. Joseph read those sentences aloud, and after penning the words, Harris would say, “Written.” An associate who interviewed Harris recorded him saying that Joseph “possessed a seer stone, by which he was enabled to translate as well as from the Urim and Thummim, and for convenience he then used the seer stone.”30
The principal scribe, Oliver Cowdery, testified under oath in 1831 that Joseph Smith “found with the plates, from which he translated his book, two transparent stones, resembling glass, set in silver bows. That by looking through these, he was able to read in English, the reformed Egyptian characters, which were engraven on the plates.”31 In the fall of 1830, Cowdery visited Union Village, Ohio, and spoke about the translation of the Book of Mormon. Soon thereafter, a village resident reported that the translation was accomplished by means of “two transparent stones in the form of spectacles thro which the translator looked on the engraving.”32