Roy,P N. (2019). International Trade: Theory and Practice (second.). New Age International Publishers.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিRoy,P N. International Trade: Theory and Practice. second. New Delhi: New Age International Publishers, 2019.
M.L.A (9 ম সংস্করণ) উদ্ধৃতিRoy,P N. International Trade: Theory and Practice. second. New Age International Publishers, 2019.