1.
Philosophy in the twentieth century. London, Boston, Sydney: Unwin paperbacks; 1982.
Philosophy in the twentieth century. London, Boston, Sydney : Unwin paperbacks, 29 mars 1982. ISBN 0-04-100044-7
Ayer Alfred Jules. (1982). Philosophy in the twentieth century. Unwin paperbacks.
Style de citation MLA (8e éd.)Ayer Alfred Jules. Philosophy in the Twentieth Century. Unwin paperbacks, 1982.
Attention : ces citations peuvent ne pas être correctes à 100%.