The Gorgonacea of the Siboga expedition - Nutting, Charles Cleveland, 1858 -1927 (E. J. Brill, 1902)

Report on the scientific results of the voyage of H.M.S. Challenger during the years 1873-76 under the command of Captain George S. Nares ... and the late Captain Frank Tourle Thomson, R.N - Thomson, C. Wyville, Sir, (Charles Wyville), 1830 -1882 (Neill, 1889)

Siboga expeditie - Weber, Max, 1852 -1937 (Brill, 1902)