Adele Faber, Elaine Mazlish (2012). “Siblings Without Rivalry: How to Help Your Children Live Together So You Can Live Too”, p.228, W. W. Norton & Company
John Milton (1846). “The Complete Poetical Works of John Milton: With Explanatory Notes and a Life of the Author, by H. Stebbing. To which is Prefixed Dr. Channing's Essay on the Poetical Genius of Milton”, p.410