(en) Maury Klein, The Change Makers: From Carnegie to Gates, How the Great Entrepreneurs Transformed Ideas Into Industries, Macmillan, (ISBN9780805069143, lire en ligne), p. 248
(en) « Mrs Rockefeller dies in Pocantico. Succumbs to heart attack after taking a glass of milk from her nurse », The New York Times, (lire en ligne)
(en-US) « Lucy Maria Spelman | Sister-in-Law of John D. Rockefeller Dies at Pocantico Hills », The New York Times, (lire en ligne, consulté le )
(en) « J.D. Rockefeller Jr. Dead at Age of 86; Philanthropist Who Made Career of Giving Millions Succumbs in Tucson », The New York Times, (lire en ligne)
(en-US) « Mrs. Rockefeller Leaves $1,500,000 Will Bequeathes $450,000 to Relatives and Remainder to Seven Institutions. Many Legacies of Jewels Husband, Son, and Daughter, as Trustees and Executors, to Apportion Gifts to Charity. », The New York Times, (lire en ligne)