Van Ggch, J. P. (1974). Applied general system theory. Harper and row.
Dyfyniad Arddull ChicagoVan Ggch, John P. Applied General System Theory. NewYork: Harper and row, 1974.
Dyfyniad MLAVan Ggch, John P. Applied General System Theory. Harper and row, 1974.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.