Wolff, Werner, (1950). Values and personality: An existential psychology of crisis, (pp. 123-127). New York City, NY, US: Grune & Stratton, x, 240 pp, The psychogram, Retrieved November 1, 2014
Modern American Poetry, Psychogram, Retrieved November 1, 2014, "...The poem which Hayden described as a ‘psychogram,’ is an epistolary form of a dramatic monologue ..."