APA aipamena

Hawking, S. (2018). Brief answers to the big questions. John Murray publishers.

Chicago Style aipamena

Hawking, Stephen. Brief Answers to the Big Questions. UK: John Murray publishers, 2018.

MLA aipamena

Hawking, Stephen. Brief Answers to the Big Questions. John Murray publishers, 2018.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.