- Lillian Gish: An Interpretation (1927)
- Utopia Americana (1929)
- The Man Charles Dickens: A Victorian Portrait (1929)
- A Guide to Bernard Shaw (1929)
- Jenny Lind (1931)
- Mark Twain: The Man and His Work (1935)
- Cavalcade of the English Novel (1942)
- The Fireside Book of Christmas Stories (1945)
- The Fireside Book of Ghost Stories (1947)
- The Fireside Book of Romance (1948)
- Cavalcade of the American Novel (1952)
- Longfellow: A Full-Length Portrait (1955)
- The Seven Worlds of Theodore Roosevelt (1958)
- Chaucer: Modern Essays in Criticism (editor, 1959)
- Nathaniel Hawthorne: Man and Writer (1961)
- Washington Irving: Moderation Displayed (1962)
- The Movies in the Age of Innocence (1962)
- Edgar Allan Poe The Man Behind the Legend (1963)
- Seven Daughters of the Theater (1964)
- Harriet Beecher Stowe: The Known and the Unknown (1965)
- Henry Wadsworth Longfellow: Portrait of an American Humanist (1966)
- Fotheringay: A Novel about Mary, Queen of Scots (1966)
- John Greenleaf Whittier: A Portrait in Paradox (1967)
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- As Far as Yesterday: Memories and Reflections (1968)
- The Personality of Chaucer (1968)
- The Glory of the Lilies: A Novel about Joan of Arc (1969)
- Marilyn Monroe: A Composite View (editor, 1969)
- William Dean Howells: The Friendly Eye (1970)
- The Personality of Milton (1970)
- James Russell Lowell: Portrait of a Man-Sided Man (1971)
- Ambassadors for Christ: Seven American Preachers (1971)
- Ralph Waldo Emerson: Portrait of a Balanced Soul (1974)
- The Personality of Shakespeare (1972)
- The Films of D.W. Griffith (1975)
- Eve and Henry James: Portraits of Women and Girls in His Fiction (1978)
- What Manner of Man? Henry David Thoreau: (1981)
- American Profile 1900-1909 (1982)
- Daughters of the Covenant (1983)
- The Novels of Henry James (1983)
- The Tales of Henry James (1984)
- Stars of the Silents (1987)
- Sir Walter Scott (1991)
- Willa Cather (1994)
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