Costin, C. (2019). The global learning crisis. Institutional Knowledge at Singapore Management University.
استشهاد بنمط شيكاغوCostin, Claudia. The Global Learning Crisis. Institutional Knowledge at Singapore Management University, 2019.
MLA استشهادCostin, Claudia. The Global Learning Crisis. Institutional Knowledge at Singapore Management University, 2019.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.