APA استشهاد

P. Moorthy. (2010). Challenges of the twenty first century. Concept.

استشهاد بنمط شيكاغو

P. Moorthy. Challenges of the Twenty First Century. New Delhi: Concept, 2010.

MLA استشهاد

P. Moorthy. Challenges of the Twenty First Century. Concept, 2010.