source
[https://books.google.co.uk/books?id=3Cx720fWi4kC&pg=PA29&source=gbs_toc_r&cad=4#v=onepage&q&f=false There are two errors in the the title of this book: A sourcebook of philosophical puzzles, paradoxes and problems], Robert M. Martin, p. 4, ISBN 1-55111-4