tinbergen, j. (1962). the appraisal of investment projects: The semi input- output method. the institute of national planning.
Chicago-viite (17. p.)tinbergen, jan. The Appraisal of Investment Projects: The Semi Input- Output Method. cairo: the institute of national planning, 1962.
MLA-viite (9. p.)tinbergen, jan. The Appraisal of Investment Projects: The Semi Input- Output Method. the institute of national planning, 1962.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.