Systems Philosophy Symposium State University of New York at Geneseo & Laszlo, E. (1973). The world system. G. Braziller.
Dyfyniad Arddull ChicagoSystems Philosophy Symposium State University of New York at Geneseo and Ervin Laszlo. The World System. New York: G. Braziller, 1973.
Dyfyniad MLASystems Philosophy Symposium State University of New York at Geneseo and Ervin Laszlo. The World System. G. Braziller, 1973.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.