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(Thank you The Real Blogger Status)
Note: don't rely on your blogging tool to use paragraph codes automatically, Blogger doesn't.
I've written from time to time about how to cite electronic sources for APA style reference lists, yet it took me a while to discover a way to achieve online the appearance of hanging indents required in APA style for papers in print.
Students. BEFORE you freak - you might not need to use that code at all.
I think educators who are encouraging students to write online, if they require students to include proper APA style in-text citations and reference lists at all, possibly wouldn't be insisting on the hanging indents. This could be because many such educators (who may be but a few online experiments ahead of their students) may not yet themselves have discovered html code that will work. Or more likely because the priority reasons that educators want their students writing online do not (and shouldn't necessarily) include in-depth familiarity with html code.
So, if you are really required to be writing academically in a blog or otherwise online, and are required to include references in APA style, you might like to check first whether your assessor wants the references hanging.