Khaisang Rukvanich. 1992. Labour force participation, time allocation and quality of life of the aged in Bangkok Metropolis. , National Institute of Development Administration;
Khaisang Rukvanich. (1992) Labour force participation, time allocation and quality of life of the aged in Bangkok Metropolis . National Institute of Development Administration/Bangkok.
Khaisang Rukvanich. Labour force participation, time allocation and quality of life of the aged in Bangkok Metropolis. . Bangkok:National Institute of Development Administration, 1992.
Khaisang Rukvanich. (1992) Labour force participation, time allocation and quality of life of the aged in Bangkok Metropolis . National Institute of Development Administration/Bangkok.