Include a correctly-written bibliography page at the end of your paper. See Rampolla, pp. Papers may be handed in early. Papers received after the deadline cannot be rewritten. In addition, papers more than a week late may receive a zero.
Plagiarism results in a zero grade.
Do not get ridiculous about this point. If you want to brighten it up, find a lively example to help make your point. Check Rampolla for the proper placement of punctuation with quotation marks, as well as for correct forms for the citations in the notes and the bibliography. If you are using a direct quotation and the author uses British spellings, then you must keep them in the quotation, but otherwise you need to use American spellings. How much footnoting you need to do depends on many factors, so this is a hard question.