APA
(1981). MMWR-Morbidity and mortality weekly report. Atlanta: U.S department of health and human services.
Chicago
1981. MMWR-Morbidity and mortality weekly report. Atlanta: U.S department of health and human services.
Harvard
(1981). MMWR-Morbidity and mortality weekly report. Atlanta: U.S department of health and human services.
MLA
MMWR-Morbidity and mortality weekly report. Atlanta: U.S department of health and human services. 1981.
