Citing a case that is quoting another case multiple times in a appellate brief?

If I cite a case, and then I cite it again ( but the second time it is citing another case) do I use short form? What if I cite the same sentence of a case quoting another case twice? I've been using the long form just to be safe but I can't seem to find a definitive rule about this in the bluebook.|||I'd use short form.





Here are some articles on cases citing cases:





http://culaw.creighton.edu/?blog%26amp;p=59





http://www.ll.georgetown.edu/guides/blue鈥?/a>|||Don't worry about this unless you are a law student. The court isn't going to care. Focus on the substance of the brief instead, and spend your time sharpening your arguments.





If you are a law student, I would just ask the relevant teacher.