Annett, F. A. (1960). Elevators: Electric and electrohydraulic elevators, escalators, moving sidewalks, and ramps (3rd ed.). New York: McGraw-Hill Book Company.
Παραπομπή Chicago StyleAnnett, Fred Anzley. Elevators: Electric and Electrohydraulic Elevators, Escalators, Moving Sidewalks, and Ramps. 3rd ed. New York: McGraw-Hill Book Company, 1960.
Παραπομπή MLAAnnett, Fred Anzley. Elevators: Electric and Electrohydraulic Elevators, Escalators, Moving Sidewalks, and Ramps. 3rd ed. New York: McGraw-Hill Book Company, 1960.
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