The University of Canterbury provides a basic guide to APA.
The University of Auckland’s resource: Quicksite is an excellent guide on how to use the APA style.
BibMe is a great site for creating bibliographies. You just enter all the information, and it produces a bibliography in the correct format.
The Weltec library site has very helpful tips on plagiarism, referencing and searching. Avoiding Plagiarism – a guide to citation practices and avoiding the pitfalls of plagiarism from the learning resource Centre at Heaton Normal Intermediate School.