Wachtel, H. I. (1955). Security for All and Free Enterprise: A Summary of the Social Philosophy of Josef Popper-Lynkeus / Ed. and with notes by Henry I. Wachtel.With an Introduction by Albert Einstein. Philosophical Library.
Lua i Stíl Chicago (17ú heag.)Wachtel, Henry I. Security for All and Free Enterprise: A Summary of the Social Philosophy of Josef Popper-Lynkeus / Ed. and with Notes by Henry I. Wachtel.With an Introduction by Albert Einstein. New York: Philosophical Library, 1955.
Lua MLA (8ú heag.)Wachtel, Henry I. Security for All and Free Enterprise: A Summary of the Social Philosophy of Josef Popper-Lynkeus / Ed. and with Notes by Henry I. Wachtel.With an Introduction by Albert Einstein. Philosophical Library, 1955.
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