APA
UNITED NATIONS E. A. S. A. (. o., UNITED NATIONS E. A. S. A. (. o., . (1970). Customs areas of the world. New Delhi: UN.
Chicago
UNITED NATIONS ECONOMIC AND SOCIAL AFFAIRS (Department of-), UNITED NATIONS ECONOMIC AND SOCIAL AFFAIRS (Department of-), . 1970. Customs areas of the world. New Delhi: UN.
Harvard
UNITED NATIONS E. A. S. A. (. o., UNITED NATIONS E. A. S. A. (. o., . (1970). Customs areas of the world. New Delhi: UN.
MLA
UNITED NATIONS ECONOMIC AND SOCIAL AFFAIRS (Department of-), UNITED NATIONS ECONOMIC AND SOCIAL AFFAIRS (Department of-), . Customs areas of the world. New Delhi: UN. 1970.
