The following is provided as a guideline only, and will need to be modified according to your preferred citation style.
Citing the Collection
University of Waikato Library. British Parliamentary Papers. Colonies: New Zealand. 2011. http://digital.liby.waikato.ac.nz/bppnz
Citing an Item from within the Collection
Copy of a Despatch from Governor Grey to Earl Grey. Government House, Auckland. 28 July 1849. 1280.01.02. British Parliamentary papers. Colonies: New Zealand. University of Waikato Library. http://digital.liby.waikato.ac.nz/bppnz. [Accessed June 20, 2011].