Ruhlmann, William (April 12, 1996). "Peter, Paul and Mary - A Song To Sing All Over This Land". Goldmine. Retrieved January 6, 2017. Next, he began looking for a deal for one of his backup singers, Mary MacGregor, who had sung on Love Songs.
riaa.com
"Gold & Platinum - RIAA". Recording Industry Association of America. RIAA. Retrieved February 2, 2017.