John Keats (2015). “The Complete Poetry of John Keats: Ode on a Grecian Urn + Ode to a Nightingale + Hyperion + Endymion + The Eve of St. Agnes + Isabella + Ode to Psyche + Lamia + Sonnets and more from one of the most beloved English Romantic poets”, p.103, e-artnow
John Keats (2015). “Sonnets (Complete Edition): 63 Sonnets from one of the most beloved English Romantic poets, influenced by John Milton and Edmund Spenser, and one of the greatest lyric poets in English Literature, alongside William Shakespeare”, p.345, e-artnow