Twenty years ago :
a book of anecdote illustrating literary life in London /
by Edmund Downey ; with sixteen portrait sketches.

APA Citation

Downey, E. (1905). Twenty years ago: a book of anecdote illustrating literary life in London. London: Hurst and Blackett.

MLA Citation

Downey, Edmund, 1856-1937. Twenty Years Ago: a Book of Anecdote Illustrating Literary Life In London. London: Hurst and Blackett, 1905.

Warning: These citations may not always be complete (especially for serials).