(1936). A step foreword for adult civic education / United States Department of the Interior. Office of Education.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रA Step Foreword for Adult Civic Education / United States Department of the Interior. Office of Education. 1936.
एमएलए (9वां संस्करण) प्रशस्ति पत्रA Step Foreword for Adult Civic Education / United States Department of the Interior. Office of Education. 1936.
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