Lua APA (7ú heag.)

HAWKING STEPHEN. (1995). BRIEF HISTORY OF TIME (UK.). BANTAM.

Lua i Stíl Chicago (17ú heag.)

HAWKING STEPHEN. BRIEF HISTORY OF TIME. UK. BANTAM, 1995.

Lua MLA (9ú heag.)

HAWKING STEPHEN. BRIEF HISTORY OF TIME. UK. BANTAM, 1995.

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