A Columbia University teaching unit on the counterculture era notes: "Although historians disagree over the influence of the counterculture on American politics and society, most describe the counterculture in similar terms. Virtually all authors—for example, on the right, Robert Bork in "Slouching Toward Gomorrah: Modern Liberalism and American Decline" (New York: Regan Books,1996) and, on the left, Todd Gitlin in "The Sixties: Years of Hope, Days of Rage" (New York: Bantam Books, 1987)—characterize the counterculture as self-indulgent, childish, irrational, narcissistic, and even dangerous. Even so, many liberal and leftist historians find constructive elements in it, while those on the right tend not to."