Spring, J. H. 3. (201). American education. New York : McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Spring, Joel H. 329693. American Education. New York : McGraw-Hill, 201.
Lua MLA (9ú heag.)Spring, Joel H. 329693. American Education. New York : McGraw-Hill, 201.
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