Go to the New Zealand Libraries' Catalogue at
http://nzlc.natlib.govt.nz
Click on the Refine button. In the location box select "Defence Library HQ New Zealand Defence Force" and then click the Set Limits button. Begin your search.
Although members of the public may not borrow from the collection, most titles are available via a local or academic library by inter-library loan.
Recommended reading
The Oxford Companion to New Zealand Military History, edited by Ian McGibbon. Auckland : OUP, 2000. This authoritative and comprehensive encyclopaedia covers subjects ranging from Aircraft to Z Special Unit. Each entry is written by an expert in the field and often includes a bibliography.
The Official War Histories are a series of almost 50 volumes covering individual campaigns and units from the time of the NZ Wars to the Korean War. The Official Histories of World War II are also available at www.nzetc.org/projects/wh2/
Many public libraries hold these titles.