APA (7th ed.) Citation

Blish, J. (1974). The day after judgement. Penguin Books.

Chicago Style (17th ed.) Citation

Blish, James. The Day After Judgement. Harmondsworth, Eng.: Penguin Books, 1974.

MLA (9th ed.) Citation

Blish, James. The Day After Judgement. Penguin Books, 1974.