APA

Manton K. G., Gu X. & Lamb V. L.Long-term trends in life expectancy and active life expectancy in the United States. : .

Chicago

Manton K G, Gu X and Lamb V L.Long-term trends in life expectancy and active life expectancy in the United States. : .

Harvard

Manton K. G., Gu X. and Lamb V. L.Long-term trends in life expectancy and active life expectancy in the United States. : .

MLA

Manton K G, Gu X and Lamb V L.: . .