Não informado. (1926). Annals of the Observatory of Lund. Observatory of Lund.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Annals of the Observatory of Lund. Lund, Suecia: Observatory of Lund, 1926.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Annals of the Observatory of Lund. Observatory of Lund, 1926.
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