Sophy Burnham (2011). “For Writers Only: Inspiring Thoughts on the Exquisite Pain and Heady Joy of the Writing Life from Its Great Practitioners”, p.148, Penguin
James Boswell, Samuel Johnson (1824). “The Life of Samuel Johnson, LL. D., Comprehending an Account of His Studies, and Numerous Works, in Chronological Order: A Series of His Epistolary Correspondence and Conversations with Many Eminent Persons; and Various Original Pieces of His Composition, Never Before Published; the Whole Exhibiting a View of Literature and Literary Men in Great Britain, for Near Half a Century During which He Flourished”, p.414