APA引文

Ryan, M. (1988). Life expectancy and mortality data from the Soviet Union.

Citação norma Chicago

Ryan, Michael. Life Expectancy and Mortality Data From the Soviet Union. 1988.

MLA引文

Ryan, Michael. Life Expectancy and Mortality Data From the Soviet Union. 1988.

警告：這些引文格式不一定是100％准確.