ISBN 978-0-19-507418-5. Ferguson, Otis. "Young Man with a Horn" (1936) and "Young Man with a Horn Again" (1940) in The Otis Ferguson Reader (Dorothy Wilson
ISBN 978-81-8495-355-8 (英语). Ferguson, Kitty. Stephen Hawking: His Life and Work. Transworld. 2011. ISBN 978-1-4481-1047-6 (英语). Ferguson 2011,第22頁. sfn error: