Some useful links for the paper

A lot of useful information about the 2001 anthrax attacks can be found here:
http://en.wikipedia.org/wiki/2001_anthrax_attack

Another excellent resource for researching news topics is the LexisNexis database, available through the Polk Library Web site:
http://web.lexis-nexis.com/universe/form/academic/s_guidednews.html

The Online Writing Lab (or OWL) at Purdue has a good overview of APA style, which should answer most of your questions:
http://owl.english.purdue.edu/handouts/research/r_apa.html

Here is the answer to the question about where punctuation marks go in relation to the citation (usually after):

Punctuation marks, such as periods, commas, and semicolons, should appear after the parenthetical citation. Question marks and exclamation points should appear within the quotation marks if they are a part of the quotation but after the parenthetical citation if they are a part of your text.