1. Medical complications during pregnancy;Burrow,1999
2. Chow, A.W. (2002). Pneumonia. Praxismd: Best health guide. Retrieved March 23, 2002, fromhttp://praxis.md/bhg/bhg.asp
3. Laboratory test and dianostic procedures;Corbett,2000
4. Williams obstetrics;Cunningham,2001
5. Pneumonia in pregnancy;Goodrum;Seminars in perinatology,1997