To space or to double space--that is the question!

I was also taught the double indent on block quotes (one from the left and one from the right). There was also a very confusing time in my life that caused many headaches over whether or not to single space or double space after periods in the works cited page. Commas in my in-text citations were another problem (although that may or may not have actually been taught to me, it might be that I made it up myself). It it's not there (for works cited), don't worry about it. Pick whatever city you want out of the publishing cities because it doesn't matter. Pick the most recent date (for copyright date). I should just invest in an MLA guide.