Okubo, M. (1981). Increase in mortality of middle-aged males in Japan. Population Research Institute, Nihon University.
Chicago-referens (17:e uppl.)Okubo, Masakazu. Increase in Mortality of Middle-aged Males in Japan. Tokyo: Population Research Institute, Nihon University, 1981.
MLA-referens (9:e uppl.)Okubo, Masakazu. Increase in Mortality of Middle-aged Males in Japan. Population Research Institute, Nihon University, 1981.
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