Salter, W. E. G. (1966). Productivity and technical change (2nd ed.). Cambridge University Press.
Lua i Stíl Chicago (17ú heag.)Salter, W. E. G. Productivity and Technical Change. 2nd ed. Cambridge: Cambridge University Press, 1966.
Lua MLA (9ú heag.)Salter, W. E. G. Productivity and Technical Change. 2nd ed. Cambridge University Press, 1966.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.