Proclamations are often published in the New Zealand Gazette. Cite them in accordance with rule 5.2.4. If the word “proclamation” does not appear in the title in the Gazette, include it at the start of the title so that it is clear that a proclamation is being cited.
Eg “Proclamation Dissolving the Parliament of New Zealand” (12 August 2005) 124 New Zealand Gazette 3031.