Ferguson, K. (1991). Stephen Hawking: Quest for a theory of everything. Bantam.
Cita Chicago (17th ed.)Ferguson, Kitty. Stephen Hawking: Quest for a Theory of Everything. Toronto: Bantam, 1991.
Cita MLA (8th ed.)Ferguson, Kitty. Stephen Hawking: Quest for a Theory of Everything. Bantam, 1991.
Atenció: Aquestes cites poden no estar 100% correctes.