APA-ийн эшлэл(7 дахь хэвлэлт)

de la Feria, R. (2009). Place where the supply/activity is effectively carried out as an allocation rule: VAT v. direct taxation. International Bureau of Fiscal Documentation.

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

de la Feria, R. Place Where the Supply/activity Is Effectively Carried Out as an Allocation Rule: VAT V. Direct Taxation. International Bureau of Fiscal Documentation, 2009.

MLA -ийн эшлэл (9 дэх хэвлэлт)

de la Feria, R. Place Where the Supply/activity Is Effectively Carried Out as an Allocation Rule: VAT V. Direct Taxation. International Bureau of Fiscal Documentation, 2009.