Fernando Pessoa (1971). “Selected poems by Fernando Pessoa: including poems by his heteronyms: Alberto Caeiro, Ricardo Reis [and] Alvaro de Campos, as well as some of his English sonnets and selections from his letters”
Henry David Thoreau (2014). “Citizen Thoreau: Walden, Civil Disobedience, Life Without Principle, Slavery in Massachusetts, A Plea for Captain John Brown”, p.61, Graphic Arts Books