sack, k., & linsel, h. (1965). contents and measuring of labour productivity in socialist industry. the institute of national planning.
Cytowanie według stylu Chicago (wyd. 17)sack, kurt, i hermann linsel. Contents and Measuring of Labour Productivity in Socialist Industry. cairo: the institute of national planning, 1965.
Cytowanie według stylu MLA (wyd. 9)sack, kurt, i hermann linsel. Contents and Measuring of Labour Productivity in Socialist Industry. the institute of national planning, 1965.