APA
Wlter Mertens, . (1994). Health and Mortality Trends among Elderly Populations. Belgium: International Union for the Scientific study of population (IUSSP).
Chicago
Wlter Mertens, . 1994. Health and Mortality Trends among Elderly Populations. Belgium: International Union for the Scientific study of population (IUSSP).
Harvard
Wlter Mertens, . (1994). Health and Mortality Trends among Elderly Populations. Belgium: International Union for the Scientific study of population (IUSSP).
MLA
Wlter Mertens, . Health and Mortality Trends among Elderly Populations. Belgium: International Union for the Scientific study of population (IUSSP). 1994.