للمتابعه من هنا
1-http://www.atsu.edu/faculty/chamberlain/Website/lectures/lecture/introurt.htm
2-http://www.squidoo.com/penicillin-antibiotics-classification
3-http://www.chemicalland21.com/info/PENICILLIN%20CLASS%20ANTIBIOTICS.htm
4-http://www.bifcpresidency.tn.gov.in/penicillin%20classification.html
5-http://www.healthy-market.org/penicillin.php
6-http://psikon2010.org/penicillin-antibiotics-classification-uses-and-side-effects/
7-http://en.wikipedia.org/wiki/Cephalosporin
8-http://en.wikipedia.org/wiki/Cephalosporin
9-http://www.articledashboard.com/Article/Cephalosporin-Antibiotics-Classification-And-Side-Effects/88057
10-http://www.ncbi.nlm.nih.gov/pubmed/3319498
10-http://jeepakistan.blogspot.com/2008/10/classification-of-cephalosporins.html
11-http://www.emedexpert.com/compare/cephalosporins.shtml
12-http://www.researchgate.net/publication/19835813_Classification_of_cephalosporins
