There are programs in addition to EndNote that do the same functions and are open source and cross-platform usable. All of the programs can import and export data to each other relatively easily, so find the one that works best for you, but if you find a need to change it will not be a problem.
The Writing Lab and the Online Writing Lab are excellent resources to assist all students. The Online Writing Lab (OWL) has APA format information, both for document formatting and reference formatting.
The Writing Lab is located in Heavilon Hall, Room 226 and is available for one-on-one 30 minute consultations with tutors. The Writing Lab works with graduate and undergraduate students.
Purdue University Libraries support the use of EndNote for citation management. EndNote Basic is the web based product and is free for Purdue students to establish an account and use.
Instructions about how to establish an account from off-campus and video tutorials on how to use EndNote are all linked from the EndNote Basic guide.
There are librarians which support different areas of research and their use of EndNote, a list of which can be found on the left side of the EndNote Basic guide page.