Cita APA (7a ed.)
Blatt, B., Kaplan, F., & Sarason, S. B. Christmas in Purgatory: A Photographic Essay on Mental Retardation. Allyn and Bacon.
Cita estilo Chicago (17a ed.)
Blatt, Burton, Fred Kaplan, y Seymour B. Sarason. Christmas in Purgatory: A Photographic Essay on Mental Retardation. Boston, EUA: Allyn and Bacon.
Cita MLA (9a ed.)
Blatt, Burton, et al. Christmas in Purgatory: A Photographic Essay on Mental Retardation. Allyn and Bacon.
Precaución: Estas citas no son 100% exactas.