مجمع السلع الاستهلاكية (البيانات المـالية)؛ خدمـة تقديم الطعـام IDB.26/2-PBC.18/3)، الصفحة 59)؛ عمليات المرأب A/54/6/Rev.1)، الجدول، باب الإيرادات 3-20).
The data provided are limited to four common services (safety and security, travel documents, buildings management and medical) and one joint service (communications), which gives a somewhat unbalanced perspective since the self-financing services are omitted, as well as other services such as printing.