Use of commas and apostrophes

https://docs.google.com/viewer?a=v&q=cache:W87flSM3ifUJ:www.prescott.edu/academics/writing/documents/CommasandApostrophes.doc+comma+after+%22in+this+paper%22&hl=xx-hacker&pid=bl&srcid=ADGEEShs4tQfRlMzGHbYUUd8lshEN2yCcCzVnHSo3fBEo-tYNAPgMmsg1GhfT1UHeNoqhusMhZeTvgMCV9OnMKH-nV022jSFVVARnou_KkDkERlM0noEijsCw99uPEbbHFwI7JFtYzdl&sig=AHIEtbSPqQ1xrHs6Vg4pBnmSwO5SB_fsig