Fonti

Electric Elevators, Their design, construction, operation and mintenance. by F. A. nnett. McGraw-Hill Book year 1935 second edition

Elevator Service, by Reginald Pelham Bolton yuear 1908

Elevators, a practical treatise on the development and design of hand, belt, steam, hydraulic, and electric elevators, by John H. Jallings. American Technical society Chicago year 1916

Elevators hydraulic and electric by Calvin F. Swingle. Frederick J Drade & Company year 1910

Hydraulic elevators, by William Baxter Jr. The engineer publishing co. year 1905

Ascensori e montacarichi elettrici di Riccardo Paolelli. Ente Nazionale Prevenzione Infortuni anno 1969

Transactions, International Engineering Congress. Passenger Elevators. year 1904

L’ascensore idraulico di Riccardo Paolelli. Ulrico Hoepli editore anno 1990

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