Happé, P. (1979). Four morality plays. Penguin Books.
Čikaški stil citiranja (17. izdanje)Happé, Peter. Four Morality Plays. Harmondsworth: Penguin Books, 1979.
MLA način citiranja (8. izdanje)Happé, Peter. Four Morality Plays. Penguin Books, 1979.
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