Não informado. (1969). Celestial Mechanics: An international journal of space dynamics. Reidel Publishing.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Celestial Mechanics: An International Journal of Space Dynamics. Dordrecht, Holanda: Reidel Publishing, 1969.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Celestial Mechanics: An International Journal of Space Dynamics. Reidel Publishing, 1969.
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