(1977). Human activity system: Its spatiotemporal structure. Tokyo: University of Tokyo Press.
Trích dẫn kiểu ChicagoHuman Activity System: Its Spatiotemporal Structure. Tokyo: University of Tokyo Press, 1977.
MLA引文Human Activity System: Its Spatiotemporal Structure. Tokyo: University of Tokyo Press, 1977.
警告:這些引文格式不一定是100%准確.