William Blake, Robert N. Essick, Joseph Viscomi (1998). “Milton a Poem, and the Final Illuminated Works: The Ghost of Abel, On Homers Poetry, [and] On Virgil, Laocoön”, p.221, Princeton University Press
William Blake (1926). “Prefatory note There is no natural religion. All religions are one. The marriage of heaven and hell Visions of the daughters of Albion. A song of liberty. America. Europe. The book of Urizen. The book of Los. Ahania. The song of Los. The four Zoas. Milton. Jerusalem. On Homer's poetry; On Virgil. Laocoön. The ghost of Abel”