Referencing is the practice of acknowledging other peoples works, ideas, sources used in a paper, assignment, report and conference papers in academic writing. Direct quotations, facts and figures, tables and images, from published as well as unpublished works need to be referenced, as do ideas and theories that originate elsewhere.
American Psychological Association (APA) style is an academic format specified in The Publication Manual of the American Psychological Association, a style guide that offers academic authors guidance on various subjects for the submission of papers to the publications of APA.
Turnitin is an internet based tool used to check and detect plagiarism in an essay or any kind of academic related document. It is licensed based software which universities and schools obtain through subscription. Go to Turnitin.com to register.