(1957). "A Model of Economic Growth". The Economic Journal. 67 (268): 591–624. doi:10.2307/2227704. JSTOR 2227704.

Kaldor, Nicholas

Besomi, Daniele (1999). (PDF). BNL Quarterly Review. 208: 95–118.

"Harrod on the classification of technological progress. The origin of a wild-goose chase"