One thing that I've found (and perhaps not the greatest of advice if you have really strict professors) is that as long as you have the appropriate information, and maybe as long as you're consistent in your use, you won't get into trouble.  As you know there are competing formats and sometimes it's difficult to determine what exactly type of material you're dealing with.  The bottom line is you need to present the pertinent information in regard to your source, and as long as you're doing it consistently I imagine you'd be fine for most classes.  I had a professor once at the graduate level who didn't know what I was writing when I included "Ibid" in a footnote or endnote (I was coming from a liberal arts background).  From what I recall she was like "what is this??"  Turns out she wanted me to use "Id.", which I now know is the norm for that particular field of study.  I've also found out that "Id." is an abbreviation for "Ibid"....talk about laziness when you need to abbreviate a four-letter word....lol.