This information can come from journal or newspaper articles, government reports, books or specific chapters of books, research dissertations or theses, or be material over the internet etc.
When you cite someone's work in the text of your assignment (an in-text citation), you also need to create a full reference.
Because APA is an American citation style, it does not have details on referencing New Zealand legislation. The format described here is sufficient in most papers:
APA has strict rules about crediting images, figures, or tables that have been reproduced or copied: a footnote stating that permission has been sought to use the image is included, with a full reference.