This introduction to modern architecture, from 1920 to the present, includes a section on late- and post-modernism. The book describes a critical point in the history of modern architecture.
Charles Alexander Jencks (born 21 June 1939) is an American architecture theorist and critic, landscape architect and designer. His books on the history and criticism of modernism and postmodernism are widely read in architectural circles. He studied under the influential architectural historians Sigfried Giedion and Reyner Banham. Jencks now lives in Scotland where he designs landscape sculpture.
In a very elitist but nonetheless informed summary of modern architectural movements, Charles Jencks enlightens the reader to a number of very short lived but nonetheless interesting architectural movements. It's probably about as dry as you can get, though, so you have to be really interested in modern architecture.