World's Best Science Fiction 1968 by Donald A. Wollheim, Terry Carr, Roger Zelazny, Andrew J. Offutt, Harlan Ellison, Ron Goulart, Keith Roberts, Larry Niven, Brian W. Aldiss, D.G. Compton, Richard Wilson, Samuel R. Delany, Colin Kapp, R.A. Lafferty, Isaac Asimov, Robert Silverberg, Thomas M. Disch