APA-čujuhus (7. p.)
Business Monitor International Ltd. Belgium oil & gas report. Business Monitor International.
Chicago-čujuhus (17. p.)
Business Monitor International Ltd. Belgium Oil & Gas Report. [Blackfriars, London]: Business Monitor International.
MLA-čujuhus (9. p.)
Business Monitor International Ltd. Belgium Oil & Gas Report. Business Monitor International.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.