Roberts, K. L. (1940). Oliver Wiswell. Doubleday, Doran & Company Inc.
Lua i Stíl Chicago (17ú heag.)Roberts, Kenneth Lewis. Oliver Wiswell. New York: Doubleday, Doran & Company Inc, 1940.
Lua MLA (9ú heag.)Roberts, Kenneth Lewis. Oliver Wiswell. Doubleday, Doran & Company Inc, 1940.
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