Graver, B. (1999). Advanced English practice (third edition.). New york: Cambridge University Press.
Chicago ZitierstilGraver, B.D. Advanced English Practice. third edition. New york: Cambridge University Press, 1999.
MLA ZitierstilGraver, B.D. Advanced English Practice. third edition. New york: Cambridge University Press, 1999.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.