Gordon, D.P.; Cooper, R.A.; Campbell, H.J. 22: Phylum HEMICHORDATA: acorn worms, pterobranchs, graptolites. In: New Zealand Inventory of Biodiversity Volume 1.
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| Gordon, D.P.; Cooper, R.A.; Campbell, H.J. 22: Phylum HEMICHORDATA: acorn worms, pterobranchs, graptolites. In: New Zealand Inventory of Biodiversity Volume 1. |