APA

Organization of the petroleum exporting countries, . (1983). Opec Annual report 1983. Vienna: OPEC.

Chicago

Organization of the petroleum exporting countries, . 1983. Opec Annual report 1983. Vienna: OPEC.

Harvard

Organization of the petroleum exporting countries, . (1983). Opec Annual report 1983. Vienna: OPEC.

MLA

Organization of the petroleum exporting countries, . Opec Annual report 1983. Vienna: OPEC. 1983.