Royal Astronomical Society, London, Cook, A. H., & Gaskell, T. F. (1961). The earth today: A collection of papers dedicated to Sir Harold Jeffreys by some of his students and colleagues on the occasion of his 70th birthday.
Chicago Style (17th ed.) CitationRoyal Astronomical Society, London, Alan H. Cook, and Thomas Frohock Gaskell. The Earth Today: A Collection of Papers Dedicated to Sir Harold Jeffreys by Some of His Students and Colleagues on the Occasion of His 70th Birthday. 1961.
MLA (9th ed.) CitationRoyal Astronomical Society, London, et al. The Earth Today: A Collection of Papers Dedicated to Sir Harold Jeffreys by Some of His Students and Colleagues on the Occasion of His 70th Birthday. 1961.
Warning: These citations may not always be 100% accurate.