I am currently reading The Limits of Realism by Tim Button. I'm having trouble understanding the convention of reference that he is using. On page 7, he writes the following:
That picture is of reasoning from a 'God's Eye point of view'.1
Then at the bottom of the page, the following is written:
1Putnam (1980a: 100; 1981c: 49; see also 1982a: 38; 1983a: x, xviii).
What do these years mean? I've looked at the bibliography, but I can't find sources corresponding to these years and the author. Here's the first two pages of the bibliography.