Παραπομπή APA

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

Παραπομπή Chicago Style

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

Παραπομπή MLA

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