Campbell, C., & Colin Campbell; Kathy Gude; JaMichael Duckworth. (2002). Matrix: Pre-Intermediate (Teacher's book). Oxford: Oxford University Press.
استشهاد بنمط شيكاغوCampbell, Colin, و Colin Campbell; Kathy Gude; JaMichael Duckworth. Matrix: Pre-Intermediate (Teacher's Book). Oxford: Oxford University Press, 2002.
MLA استشهادCampbell, Colin, و Colin Campbell; Kathy Gude; JaMichael Duckworth. Matrix: Pre-Intermediate (Teacher's Book). Oxford: Oxford University Press, 2002.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.