APA استشهاد

Hoyle, F. (1960). The nature of the universe. Penguin Books.

استشهاد بنمط شيكاغو

Hoyle, Fred. The Nature of the Universe. England: Penguin Books, 1960.

MLA استشهاد

Hoyle, Fred. The Nature of the Universe. Penguin Books, 1960.