Ferguson, K. (1991). Stephen Hawking: Quest for a theory of everything. Bantam.
Lua i Stíl Chicago (17ú heag.)Ferguson, Kitty. Stephen Hawking: Quest for a Theory of Everything. Toronto: Bantam, 1991.
Lua MLA (8ú heag.)Ferguson, Kitty. Stephen Hawking: Quest for a Theory of Everything. Bantam, 1991.
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