Please, cite Total Factor Productivity Toolbox as:
Balk, B.M. & Barbero, J. & Zofío, J.L. (2020), A toolbox for calculating and decomposing Total Factor Productivity indices, Computers & Operations Research, Volume 115 (104853), 1-23. https://doi.org/10.1016/j.cor.2019.104853
Balk, B.M. & Zofío, J.L., (2018). The Many Decompositions of Total Factor Productivity Change, ERIM Report Series Research in Management ERS-2018-003-LIS, Erasmus Research Institute of Management (ERIM), Erasmus University Rotterdam, The Netherlands.