Happé, P. (1979). Four morality plays. Penguin Books.
Chicago-Zitierstil (17. Ausg.)Happé, Peter. Four Morality Plays. Harmondsworth: Penguin Books, 1979.
MLA-Zitierstil (8. Ausg.)Happé, Peter. Four Morality Plays. Penguin Books, 1979.
警告：這些引文格式不一定是100％准確.