Mormon false prophet Joseph Smith stated several times (in his writings which are considered LDS "Scripture") that the Father, Son, and Holy Spirit/Ghost are "one God"--even though he and Mormonism teach Tritheism. On the other hand, Seventh-day Adventist false prophet Ellen G. White never once even said that the Father, Son, and Holy Spirit are one God.
Here are several quotes from Joseph Smith's writings:
"And now, behold, my beloved brethren, this is the way; and there is none other way nor name given under heaven whereby man can be saved in the kingdom of God. And now, behold, this is the doctrine of Christ, and the only and true doctrine of the Father, and of the Son, and of the Holy Ghost, which is one God, without end. Amen." (The Book of Mormon, 2 Nephi 31:21. http://scriptures.lds.org/en/2_ne/31)
"Now, this restoration shall come to all, both old and young, both bond and free, both male and female, both the wicked and the righteous; and even there shall not so much as a hair of their heads be lost; but every thing shall be restored to its perfect frame, as it is now, or in the body, and shall be brought and be arraigned before the bar of Christ the Son, and God the Father, and the Holy Spirit, which is one Eternal God, to be judged according to their works, whether they be good or whether they be evil." (The Book of Mormon, Alma 11:44. http://scriptures.lds.org/en/alma/11)
"And he hath brought to pass the redemption of the world, whereby he that is found guiltless before him at the judgment day hath it given unto him to dwell in the presence of God in his kingdom, to sing ceaseless praises with the choirs above, unto the Father, and unto the Son, and unto the Holy Ghost, which are one God, in a state of happiness which hath no end." (The Book of Mormon, Mormon 7:7. http://scriptures.lds.org/en/morm/7)
"As well as those who should come after, who should believe in the gifts and callings of God by the Holy Ghost, which beareth record of the Father and of the Son; 28 Which Father, Son, and Holy Ghost are one God, infinite and eternal, without end. Amen." (Doctrine and Covenants, 20:27-28. http://scriptures.lds.org/en/dc/20)
Also, the following is a quote from the "Title Page" of The Book of Mormon:
"An abridgment taken from the Book of Ether also, which is a record of the people of Jared, who were scattered at the time the Lord confounded the language of the people, when they were building a tower to get to heaven—Which is to show unto the remnant of the House of Israel what great things the Lord hath done for their fathers; and that they may know the covenants of the Lord, that they are not cast off forever—And also to the convincing of the Jew and Gentile that Jesus is the Christ, the Eternal God, manifesting himself unto all nations—And now, if there are faults they are the mistakes of men; wherefore, condemn not the things of God, that ye may be found spotless at the judgment-seat of Christ." (http://scriptures.lds.org/en/bm/ttlpg)
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