Okita, S. (1982). Population, natural resources, environment and human resources in development. Population Research Institute, Nihon University.
Cita Chicago (17th ed.)Okita, Saburo. Population, Natural Resources, Environment and Human Resources in Development. Tokyo: Population Research Institute, Nihon University, 1982.
Cita MLA (9th ed.)Okita, Saburo. Population, Natural Resources, Environment and Human Resources in Development. Population Research Institute, Nihon University, 1982.
Atenció: Aquestes cites poden no estar 100% correctes.