Ferguson, K. (1991). Stephen Hawking: Quest for a theory of everything. Bantam Books.
Citazione stile Chigago Style (17a edizione)Ferguson, Kitty. Stephen Hawking: Quest for a Theory of Everything. New York: Bantam Books, 1991.
Citatione MLA (9a ed.)Ferguson, Kitty. Stephen Hawking: Quest for a Theory of Everything. Bantam Books, 1991.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.