Countee Cullen, Gerald Lyn Early (1991). “My soul's high song: the collected writings of Countee Cullen, voice of the Harlem Renaissance”, Doubleday Books
Octavio Paz (1985). “The Labyrinth of Solitude: And the Other Mexico ; Return to the Labyrinth of Solitude ; Mexico and the United States ; The Philanthropic Ogre”, p.60, Grove Press
Sogyal Rinpoche (2009). “The Tibetan Book of Living and Dying: The Spiritual Classic & International Bestseller: Revised and Updated Edition”, p.21, Harper Collins
Sigmund Freud (2016). “SIGMUND FREUD Ultimate Collection: Psychoanalytic Studies, Theoretical Essays & Articles: The Interpretation of Dreams, Psychopathology of Everyday Life, Dream Psychology, Three Contributions to the Theory of Sex, Beyond the Pleasure Principle, Totem and Taboo, Leonardo da Vinci…”, p.2064, e-artnow