APA (7 वां संस्करण) प्रशस्ति पत्र

Não informado. (1970). Current sweden: Environment planning and conservation. Swedish Institute.

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

Não informado. Current Sweden: Environment Planning and Conservation. Stockholm: Swedish Institute, 1970.

एमएलए (8वां संस्करण) प्रशस्ति पत्र

Não informado. Current Sweden: Environment Planning and Conservation. Swedish Institute, 1970.

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