LONGMAN. (1983). Financial times oil and gas international year book 1983. Longmans Inc.
Čikaški stil citiranja (17. izdanje)LONGMAN. Financial Times Oil and Gas International Year Book 1983. Longmans Inc, 1983.
MLA način citiranja (8. izdanje)LONGMAN. Financial Times Oil and Gas International Year Book 1983. Longmans Inc, 1983.
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