Malhotra, R., Malhotra, D., & Lermack, H. (o. J.). Using data envelopment analysis to analyze the performance of North American class I freight railroads [Electronic]. Financial Modeling Applications and Data Envelopment Applications, ((2009), Seite 113-131), , Seite 113-131. https://doi.org/10.1108/S0276-8976(2009)0000013009

MALHOTRA, Rashmi, MALHOTRA, D.K. und LERMACK, Harvey, [no date]. Using data envelopment analysis to analyze the performance of North American class I freight railroads. Financial Modeling Applications and Data Envelopment Applications. No. (2009), Seite 113-131, p. , Seite 113-131. DOI 10.1108/S0276-8976(2009)0000013009.

Malhotra, R., D. Malhotra, und H. Lermack. „Using data envelopment analysis to analyze the performance of North American class I freight railroads“. Financial Modeling Applications and Data Envelopment Applications, electronic, Nr. (2009), Seite 113-131, Emerald Group Publishing Limited [Erscheinungsort nicht ermittelbar] : Emerald Group Publishing Limited, S. , Seite 113-131, https://doi.org/10.1108/S0276-8976(2009)0000013009.

Malhotra, Rashmi/Malhotra, D.K./Lermack, Harvey: Using data envelopment analysis to analyze the performance of North American class I freight railroads, Financial Modeling Applications and Data Envelopment Applications , Seite 113-131.

Malhotra, R., Malhotra, D. und Lermack, H. (o. J.). „Using data envelopment analysis to analyze the performance of North American class I freight railroads“, Financial Modeling Applications and Data Envelopment Applications, Emerald Group Publishing Limited [Erscheinungsort nicht ermittelbar] : Emerald Group Publishing Limited, Bingley, UK, No. (2009), Seite 113-131, S. , Seite 113-131.