Sources list for DISCREPANCIES GRAPES WRATH:

Meyer, M. "Fermenting The Grapes of Wrath: From Violent Anger Distilling Sweet Concord. " The Critical Response to John Steinbeck's The Grapes of Wrath. Heavilin, B.A. (ed.) Westport, CT: Greenwood Press, 2000, p. 327-339.
John Steinbeck's "The Grapes of Wrath"

Brown, M. M. "The Grapes of Wrath and the Literary Canon of American Universities in the Nineties." The Critical Response to John Steinbeck's The Grapes of Wrath. Heavilin, B.A. (ed.) Westport, CT: Greenwood Press, 2000. p. 285-298
John Steinbeck's "The Grapes of Wrath"

Linda C. Pelzer, "Honoring an American Classic: Viking's 1989 Edition of John Steinbeck's the Grapes of Wrath (Review)," The Critical Response to John Steinbeck's the Grapes of Wrath, ed. Barbara A. Heavilin (Westport, CT: Greenwood Press, 2000) 310.
Historical Context of American Literature

Pelzer, Linda C. "Honoring an American Classic: Viking's 1989 Edition of John Steinbeck's the Grapes of Wrath (Review)." The Critical Response to John Steinbeck's the Grapes of Wrath. Ed. Heavilin, Barbara A. Westport, CT: Greenwood Press, 2000. 309-311.
Historical Context of American Literature

Pelzer, Linda C. "Honoring an American Classic: Viking's 1989 Edition of John Steinbeck's the Grapes of Wrath (Review)." The Critical Response to John Steinbeck's the Grapes of Wrath. Ed. Heavilin, Barbara A. Westport, CT: Greenwood Press, 2000. 309-311.
Isolation in American Literature