Ferguson, K. (1991). Stephen Hawking: Quest for a theory of everything. Bantam.
Cita Chicago Style (17a ed.)Ferguson, Kitty. Stephen Hawking: Quest for a Theory of Everything. Toronto: Bantam, 1991.
Cita MLA (8a ed.)Ferguson, Kitty. Stephen Hawking: Quest for a Theory of Everything. Bantam, 1991.
Precaución: Estas citas no son 100% exactas.