Donthu N, EK Hershberger and T Osmonbekov (2005). “Benchmarking Marketing Productivity Using Data Envelopment Analysis.” J Business Research 58(11): 1474-1482.
Donthu N, EK Hershberger and T Osmonbekov (2005). “Benchmarking Marketing Productivity Using Data Envelopment Analysis.” J Business Research 58(11): 1474-1482.