Não informado. (1972). Annals of the Research Institute of Epidemiology and Microbiology. Ministery of Public Health.
Chicagoスタイル(17版)引用形式Não informado. Annals of the Research Institute of Epidemiology and Microbiology. Sofia: Ministery of Public Health, 1972.
MLA(8版)引用形式Não informado. Annals of the Research Institute of Epidemiology and Microbiology. Ministery of Public Health, 1972.
警告: この引用は必ずしも正確ではありません.