Note:  Style guides are updated regularly.  Don't worry if you find minor differences between information here (between one source and another and/or between this and an ASA self-test that may be in your course.  I'm constantly working on updates to match the latest style guide but I don't always get things changed in all the various places at the same time.  I won't grade off for minor issues like that, particularly where I know that those discrepancies exist.