APA استشهاد

Kolakowski, L. (2008). Why is there something rather than nothing: Questions from great philosophers. Penguin Books.

استشهاد بنمط شيكاغو

Kolakowski, Leszek. Why Is There Something Rather than Nothing: Questions from Great Philosophers. London: Penguin Books, 2008.

MLA استشهاد

Kolakowski, Leszek. Why Is There Something Rather than Nothing: Questions from Great Philosophers. Penguin Books, 2008.