Crisostomo, S. (2012). Pfizer says product recall only due to incorrect declaration. Philippine Star.
Chicago-referens (17:e uppl.)Crisostomo, Sheila. "Pfizer Says Product Recall Only Due to Incorrect Declaration." Philippine Star 2012.
MLA-referens (9:e uppl.)Crisostomo, Sheila. "Pfizer Says Product Recall Only Due to Incorrect Declaration." Philippine Star, 2012.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.