Cita APA (7th ed.)

HAWKING STEPHEN. (2001). UNIVERSE IN A NUTSHELL. BANTAM BOOKS.

Cita Chicago (17th ed.)

HAWKING STEPHEN. UNIVERSE IN A NUTSHELL. NEW YORK: BANTAM BOOKS, 2001.

Cita MLA (9th ed.)

HAWKING STEPHEN. UNIVERSE IN A NUTSHELL. BANTAM BOOKS, 2001.