1. The Structure of Macro-Economic Models
2. Het statistische verband tussen arbeidsproduktiviteit en produktie
3. 4. P. Cagan , The monetary dynamics of hyperinflation, Studies in the quantity theory of money, Chicago, 1956 , blz.24 -117 .
4. 5. G. C. Chow , Demand for automobiles in the United States , A study in consumer durables, Amsterdam, 1957 .