Apa citation format http://essayservice.com/blog/apa-citiation-format is used for citing sources in research papers, reports, and other academic work. It's used by most researchers, teachers, students, and professionals. It's a very easy and effective way to cite sources and validate your conclusions. Citing sources is a vital part of the process of writing a paper. It gives readers an idea of what your work is based on and helps to ensure that it is reputable. The format includes guidelines for formatting the entire paper as well as for the presentation of references. APA style is also used for citing electronic sources.