[ num ] sp capword sp othword sp othword sp capword sp othword sp capword sp capword sp capword sp / sp capword . sp othword sp capword sp capword sp [ othword sp othword . ] . sp – – upword , sp year . sp – – sp capword . sp num sp othword sp capword , sp othword , sp othword . sp – – sp upword : sp num - year - num - num - num . sp – – sp upword : othword : / / othword . othword / num . num / num . num .