Gingrich, Arnold (May 1960). Coronet. D. A. Smart. p. 13.
Nelson, Nancy (2003). Evenings With Cary Grant: Recollections in His Own Words by Those Who Knew Him Best. New York: Citadel Press. p. 133. ISBN0-8065-2412-X. "Dina Merrill's father (E. F. Hutton) and Barbara Hutton's father were brothers. Dina recalls: 'Cary and Barbara Hutton came to visit us in Washington right after they were married. [...] I was thrilled my cousin had married this eminent movie star.'"
"Engagement Announced". Lansing State Journal. August 7, 1959. p. 23. Retrieved July 8, 2024. "Actress Jill St. John, shown with Lance Reventlow, dime store heir [...] Reventlow, 23, son of Woolworth heiress Barbara Hutton and her former husband, Danish nobleman Count Haugwitz-Reventlow, operates a stable of racing cars."