APA (7e ed.) Bronvermelding

Não informado. (1987). UNCTAD commodity yearbook. United Nations.

Chicago (17e ed.) Bronvermelding

Não informado. UNCTAD Commodity Yearbook. New York: United Nations, 1987.

MLA (8e ed.) Bronvermelding

Não informado. UNCTAD Commodity Yearbook. United Nations, 1987.

Let op: Deze citaties zijn niet altijd 100% accuraat.