«Sandman»(en inglés). Consultado el 7 de octubre de 2017.
archive.org
Manning, Matthew K.; Gilbert, Laura, ed. (2012). «1960s». Spider-Man Chronicle Celebrating 50 Years of Web-Slinging. Dorling Kindersley. p. 20. ISBN978-0756692360. «In this installment, Stan Lee and Steve Ditko introduced Sandman – a super villain who could turn his entire body into sand with a single thought.»
Manning, Matthew K.; Gilbert, Laura, ed. (2012). «1960s». Spider-Man Chronicle Celebrating 50 Years of Web-Slinging. Dorling Kindersley. p. 20. ISBN978-0756692360. «In this installment, Stan Lee and Steve Ditko introduced Sandman - a super villain who could turn his entire body into sand with a single thought.»