Hill, L. (1992). Word Power 4500: Vocabulary Tests and Exercises in American English. Oxford: Oxford University Press.
استشهاد بنمط شيكاغوHill, L.a. Word Power 4500: Vocabulary Tests and Exercises in American English. Oxford: Oxford University Press, 1992.
MLA استشهادHill, L.a. Word Power 4500: Vocabulary Tests and Exercises in American English. Oxford: Oxford University Press, 1992.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.