The crossroads of liberalism; Croly, Weyl, Lippmann, and the progressive era, 1900-1925.

Forcey, Charles, 1925-2008.
New York : Oxford University Press, 1961.

Herbert Croly of the New republic : the life and thought of an American progressive

Levy, David W., 1937-
Princeton, N.J. : Princeton University Press, [1985]

Herbert Croly of the New Republic : the Life and Thought of an American Progressive.

Levy, David W., 1937-
Princeton : Princeton University Press, 2014.

Shaping modern liberalism : Herbert Croly and progressive thought

Stettner, Edward A., 1940-
Lawrence, Kan. : University Press of Kansas, [1993]

Shaping Modern Liberalism : Herbert Croly and Progressive Thought

Stettner, Edward A., 1940- author.
Lawrence, Kan University Press of Kansas 1993.