Editions of Betrayer of Worlds (Ringworld)

mass market paperback, 400 pages

Published May 24, 2011 by Tor Science Fiction, Brand: Tor Science Fiction 2011-05-24.

Paperback, 402 pages

Published May 24, 2011 by Tor Trade.

English language

Published Nov. 20, 2010 by Tor.

mp3 cd

Published Oct. 12, 2010 by Blackstone Audio, Inc., Blackstone Audiobooks.

English language

Published Nov. 20, 2010 by Doherty Associates, LLC, Tom.