Macdonald, G. F. <br/><br/>
Perception and identity: essays presented to A. J. Ayer, with his replies to then. 
A. J. Ayer and G. F. Macdonald 
 - London  Macmillan  1979 
 - 358p.: port. 
<br/><br/> ''The philosophical works of A. J. Ayer'':p334 -- 341p. Biblography: p. 343 -- 346