Organisation for Economic Co-operation and Development & Centre for Co-operation with European Economies in Transition. (1992). Bulgaria: An economic assessment. Organization for economic co-operation and development, Centre for co-operation with the european economies in transition.
Παραπομπή σε μορφή Chicago (17η εκδ.)Organisation for Economic Co-operation and Development και Centre for Co-operation with European Economies in Transition. Bulgaria: An Economic Assessment. Paris: Organization for economic co-operation and development, Centre for co-operation with the european economies in transition, 1992.
Παραπομπή σε μορφή MLA (9th εκδ.)Organisation for Economic Co-operation and Development και Centre for Co-operation with European Economies in Transition. Bulgaria: An Economic Assessment. Organization for economic co-operation and development, Centre for co-operation with the european economies in transition, 1992.