Ray, G. F. (1984). The diffusion of mature technologies. Cambridge: Cambridge University Press.
Dyfyniad Arddull ChicagoRay, George F. The Diffusion of Mature Technologies. Cambridge: Cambridge University Press, 1984.
Dyfyniad MLARay, George F. The Diffusion of Mature Technologies. Cambridge: Cambridge University Press, 1984.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.