Educational Testing Service. ETS research report series. Educational Testing Service.
Chicago-Zitierstil (17. Ausg.)Educational Testing Service. ETS Research Report Series. Princeton, N.J.: Educational Testing Service.
MLA-Zitierstil (9. Ausg.)Educational Testing Service. ETS Research Report Series. Educational Testing Service.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.