«Frequently Asked Questions about Isaac Asimov». Isaac Asimov Home Page(en inglés). 11 de julio de 2014. 4.11 Did Asimov write the Foundation books with any plan in mind?. Consultado el 7 de enero de 2019. «... The Robots of Dawn, which created the first (implicit) connection between the Foundation and Robot books. This connection, which was not anticipated when Asimov started writing robot and Foundation stories in the 1940s, was finally made explicit in the next two books written, Robots and Empire and Foundation and Earth.»
