1. A note on the Roman hypocaust, and the Korean on-dol, the Chinese kang;Cowan;Architectural Science Review,1987
2. Phelps Brown EH, Hopkins SV. Seven centuries of building wages. In: Carns-Wilson EM, editor. Essays in economic history, II (1962);
3. London: 1955. p. 168–78.
4. Money and its use in Medieaval Europe;Spufford,1988
5. Building and civil engineering construction;Hamilton,1958