Gaya APA

Ayer, A, [, , , , ]. (1976). The central questions of philosophy, [repr.ed.]. Cet.pertama 1973. . [Harmondsworth]: Penguin Books.

Gaya MLA

Ayer, A.J., [1910-, , , , ]. "The central questions of philosophy, [repr.ed.]. Cet.pertama 1973. ". [Harmondsworth]: Penguin Books, 1976. Buku.