Hartley, B. (1985). Streamline english: Departures (6a. ed.). Oxford University Press.
Cita Chicago Style (17a ed.)Hartley, Bernard. Streamline English: Departures. 6a. ed. New York: Oxford University Press, 1985.
Cita MLA (9a ed.)Hartley, Bernard. Streamline English: Departures. 6a. ed. Oxford University Press, 1985.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.