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Constitutional Liberty: In which is Shown the Right of a Nation to Secede from a Compact of Federation and that Such Right is Necessary to Constitutional Liberty and
فلوریدا آتلانتیک Libraries Kenneth Arrow (۱۹۲۱–). The Concise Encyclopedia of Economics. Library of Economics and Liberty (ویراست ۲nd). LibertyFund. ۲۰۰۸.
IDEAS/RePEc Bertil Gotthard Ohlin (۱۸۹۹–۱۹۷۹). The Concise Encyclopedia of Economics. Library of Economics and Liberty (ویراست ۲nd). LibertyFund. ۲۰۰۸.