Klemm, F., & Singer, D. W. (1964). A history of western technology (1ª ed.). Cambridge, Mass: The Massachusetts Institute of Technology.
Cita MLA (8 ed.) (Copiar al portapapeles)Klemm, Friedrich, and Dorothea Waley Singer. A History of Western Technology. 1ª ed. Cambridge, Mass: The Massachusetts Institute of Technology , 1964.