11 Feb 1996. 30 Sept. 1998. Zirconium Uses in the 20th Century. 30 Sept. 1998. You'll notice that there is no page number listed for a book on the Works Cited page, but there is for magazines.
Periods go inside quotation marks.
Each piece of information and each source line ends with a period. There is a period between the name of a book and its publisher or date, but on a magazine the date follows the name of the magazine with no period or comma between. If there is a date given for when information was posted on the Internet, it is listed after the title of the page. The date you printed out or down-loaded the information is given just before the address.