‘Larwin Armstrong is to be praised for providing us with a valuable scholarly edition of Gerard’s influential work.’- Stephen H. Rigby (Economic History Review vol 69:04:2016) ‘This book is fabulously useful scholarly resource, as well as a provocative call which deserves to be widely read.’- H. Skoda (English Historical Review September 2017) ‘To bring together in this way intellectual history and economic history is an admirable proposal and this translation a good point to start.’- Sybil M. Jack (Parergon vol 34:02:2017) "Lawrin Armstrong has provided a precise transcription and lucid translation of three texts by Gerard of Siena..."- James Davis, Queen's University Belfast (Speculum, Vol 94 no 3, July 2019)