APA

Asimov I., . (1974). Asimov on Astronomy. london: Hodder and Stoughton.

Chicago

Asimov Issac, . 1974. Asimov on Astronomy. london: Hodder and Stoughton.

Harvard

Asimov I., . (1974). Asimov on Astronomy. london: Hodder and Stoughton.

MLA

Asimov Issac, . Asimov on Astronomy. london: Hodder and Stoughton. 1974.