Παραπομπή APA

Sen, U. (1992). Customs tariff and administration. Vikas publishing house Pvt. Ltd.

Παραπομπή Chicago Style

Sen, U.K. Customs Tariff and Administration. New Delhi: Vikas publishing house Pvt. Ltd, 1992.

Παραπομπή MLA

Sen, U.K. Customs Tariff and Administration. Vikas publishing house Pvt. Ltd, 1992.