Jacks, L. P. (1928). Constructive citizenship. Doubleday, Doran & Company.
Lua i Stíl Chicago (17ú heag.)Jacks, L. P. Constructive Citizenship. Garden City, N.Y.: Doubleday, Doran & Company, 1928.
Lua MLA (8ú heag.)Jacks, L. P. Constructive Citizenship. Doubleday, Doran & Company, 1928.
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