ERMS 2.0: Costello, M.J.; Bouchet, P.; Boxshall, G.; Arvanitidis, C.; Appeltans, W. (2025). European Register of Marine Species. Accessed at http://www.marbef.org/data/erms.php on yyyy-mm-dd, more
Pérez, C.D.; Cordeiro, R.T.S.; Williams, G.C.; Gomes, P.B. (2021). Revised nomenclature of the sea pen genus Balticina Gray, 1870 (= Halipteris Kölliker, 1870) (Anthozoa: Octocorallia). Zootaxa 4966(2): 237-244. https://dx.doi.org/10.11646/zootaxa.4966.2.10
Williams, G.C. (2021). The deep-sea pennatulacean genus Porcupinella – with the description of a new species from Tasmania (Anthozoa, Octocorallia, Chunellidae). ZooKeys 1019: 1-14. https://dx.doi.org/10.3897/zookeys.1019.61789
Williams, G.C. (2019). A new genus and species of enigmatic gorgonian coral from the Ryukyu Archipelago, northwestern Pacific, with a discussion of calcaxonian systematics (Cnidaria, Anthozoa, Octocorallia). Zootaxa 4701(5): 417-433. https://dx.doi.org/10.11646/zootaxa.4701.5.2
Williams, G.C. (2013). New taxa and revisionary systematics of alcyonacean octocorals from the Pacific coast of North America (Cnidaria, Anthozoa). ZooKeys 283(283): 15-42. https://dx.doi.org/10.3897/zookeys.283.4803
López-González, P.J.; Gili, J.-M.; Williams, G.C. (2001). New records of Pennatulacea (Anthozoa: Octocorallia) from the African Atlantic coast, with description of a new species and a zoogeographic analysis. Sci. Mar. (Barc.) 65(1): 59-74
Williams, G.C. (1999). Index Pennatulacea: annotated bibliography and indexes of the Sea Pens (Coelenterata: Octocorallia) of the World 1469-1999. Proc. Calif. Acad. Sci. 51(2): 19-103, 1 fig., 14 plates
Williams, G.C.; Gosliner, T.M. (Ed.) (2014). The coral triangle: the 2011 Hearst Philippine biodiversity expedition. California Academy of Sciences: San Fransisco. 592 pp.
Gosliner, T.M.; Behrens, D.W.; Williams, G.C. (1996). Coral reef animals of the Indo-Pacific: Animal life from Africa to Hawaii exclusive of the vertebrates. Sea Challengers: Monterey. ISBN 0-930118-21-9. 314 pp.
Williams, G.C.; van der Land, J. (2001). Octocorallia - Pennatulacea, in: Costello, M.J. et al. (Ed.) European register of marine species: a check-list of the marine species in Europe and a bibliography of guides to their identification. Collection Patrimoines Naturels, 50: pp. 105-106, more
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