Passionate Productions for BBC ; produced for NOVA by Holt Productions, LLC ; WGBH Boston ; produced and directed by Jemima Harrison and Sarah Holt ; writer for the BBC, Jemima Harrison ; executive producer for the BBC, Richard Klein ; senior executive producer, Paula S. Apsell
sponsored by the Committee on Human Diversity of the American Academy of Arts and Sciences, 1973-1974 ; edited by Bernard D. Davis and Patricia Flaherty