Għal aktar informazzjoni dwar il-produttività multifattur, ara Productivity Business Sector and Major Subsectors, BLS Handbook of Methods, Bureau of Labor Statistics (April 1997), pp. 89-98; u Edwin R. Dean u Michael J. Harper, The BLS Productivity Measurement Program, Bureau of Labor Statistics (Lulju 5, 2000), karta ppreżentata lill-NBER Conference on Research in Income and Wealth on New Directions in Productivity Analysis, Marzu 20- 21, 1998.
L-uniku sors ta 'informazzjoni dwar il-produttività b'ħafna fatturi jinsab f'pubblikazzjoni tal-Uffiċċju tal-Istatistika tax-Xogħol.