Não informado. (1964). Adult education in Finland. Society for Popular Culture.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Adult Education in Finland. Helsinki: Society for Popular Culture, 1964.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Adult Education in Finland. Society for Popular Culture, 1964.
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