Ong, W. J. (1952). Basel, Switzerland, as seen across Barfüsser Platz.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रOng, Walter J. Basel, Switzerland, as Seen Across Barfüsser Platz. 1952.
एमएलए (8वां संस्करण) प्रशस्ति पत्रOng, Walter J. Basel, Switzerland, as Seen Across Barfüsser Platz. 1952.
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