Alexander Pope, William Lisle Bowles, William Warburton, Joseph Warton (1806). “The Works of Alexander Pope, Esq., in Verse and Prose: Containing the Principal Notes of Drs. Warburton and Warton”, p.79
Samuel Taylor Coleridge (1858). “The complete works of Samuel Taylor Coleridge: With an introductory essay upon his philosophical and theological opinions”, p.230
Dr. Robert C. Worstell, Claude C. Hopkins (2014). “Scientific Advertising - Masters of Marketing Secrets: From the First Great Copywriter”, p.75, Lulu.com