hansen, b. (1962). output- productivity and value added- productivity. the institute of national planning.
Chicago-viite (17. p.)hansen, bent. Output- Productivity and Value Added- Productivity. cairo: the institute of national planning, 1962.
MLA-viite (9. p.)hansen, bent. Output- Productivity and Value Added- Productivity. the institute of national planning, 1962.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.