Heller, F. H. (1952). Introduction to American constitutional law: A selection of cases and materials. Harper.
Lua i Stíl Chicago (17ú heag.)Heller, Francis Howard. Introduction to American Constitutional Law: A Selection of Cases and Materials. New York: Harper, 1952.
Lua MLA (9ú heag.)Heller, Francis Howard. Introduction to American Constitutional Law: A Selection of Cases and Materials. Harper, 1952.
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