APA引文

organization of the petroleum exporting countries. (2017). annual report 2017. grasl druck & neue medien gmbh.

Chicago Style (17th ed.) Citation

organization of the petroleum exporting countries. Annual Report 2017. austria: grasl druck & neue medien gmbh, 2017.

MLA引文

organization of the petroleum exporting countries. Annual Report 2017. grasl druck & neue medien gmbh, 2017.

警告：這些引文格式不一定是100％准確.