Ülengin, F., Kabak, Özgür, Önsel, Şule und Aktaş, E. (ohne Datum) „Assessment of implication of competitiveness on human development of countries through data envelopment analysis and cluster analysis“, Financial Modeling Applications and Data Envelopment Applications, ((2009), Seite 199-226), S. , Seite 199-226. doi:10.1108/S0276-8976(2009)0000013013.

Ülengin, Füsun, Özgür Kabak, Şule Önsel, und Emel Aktaş. „Assessment of implication of competitiveness on human development of countries through data envelopment analysis and cluster analysis“. Electronic. Financial Modeling Applications and Data Envelopment Applications, Nr. (2009), Seite 199-226 (o. J.): , Seite 199-226. https://doi.org/10.1108/S0276-8976(2009)0000013013.

Ülengin, F., Kabak, Özgür, Önsel, Şule, & Aktaş, E. (o. J.). Assessment of implication of competitiveness on human development of countries through data envelopment analysis and cluster analysis [Electronic]. Financial Modeling Applications and Data Envelopment Applications, (2009), Seite 199-226, , Seite 199-226. https://doi.org/10.1108/S0276-8976(2009)0000013013

Ülengin, F., Özgür Kabak, Şule Önsel, und E. Aktaş. „Assessment of implication of competitiveness on human development of countries through data envelopment analysis and cluster analysis“. Financial Modeling Applications and Data Envelopment Applications, electronic, Nr. (2009), Seite 199-226, Emerald Group Publishing Limited [Erscheinungsort nicht ermittelbar] : Emerald Group Publishing Limited, S. , Seite 199-226, https://doi.org/10.1108/S0276-8976(2009)0000013013.

ÜLENGIN, Füsun, Özgür KABAK, Şule ÖNSEL und Emel AKTAŞ, [kein Datum]. Assessment of implication of competitiveness on human development of countries through data envelopment analysis and cluster analysis. Financial Modeling Applications and Data Envelopment Applications. Nr. (2009), Seite 199-226, S. , Seite 199-226. DOI 10.1108/S0276-8976(2009)0000013013