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APA Formatting and Style Guide[OWL at Purdue] 7th edition update coming later in Spring 2020! https://owl.purdue.edu/owl/research_and_citation/apa_style/apa_style_introduction.html
Other Style Guides
See SLU Libraries Research Guide:Style Guides and Manuals​http://libguides.slu.edu/styleguides_manuals