Göktürk, E.; Yalçınkaya, H. S. (2020). "The investigation of relationship between Corruption Perception Index and GDP in the case of the Balkans". International Journal of Management Economics and Business. 16 (4). doi:10.17130/ijmeb.853535. ISSN2147-9208.
Onyeogulu, T; Ogoke, U.P. (29 January 2023). "Statistical Analyses on the Correlation of Corruption Perception Index and Some Other Indices in Nigeria". Scientia Africana. 21 (3): 37–48. doi:10.4314/sa.v21i3.3. ISSN1118-1931.
Göktürk, E.; Yalçınkaya, H. S. (2020). "The investigation of relationship between Corruption Perception Index and GDP in the case of the Balkans". International Journal of Management Economics and Business. 16 (4). doi:10.17130/ijmeb.853535. ISSN2147-9208.
Onyeogulu, T; Ogoke, U.P. (29 January 2023). "Statistical Analyses on the Correlation of Corruption Perception Index and Some Other Indices in Nigeria". Scientia Africana. 21 (3): 37–48. doi:10.4314/sa.v21i3.3. ISSN1118-1931.