Howe, John (April 1840). "Manufacture of Pins". American Journal of Science and Arts. 38 (1): Appendix, p. 3.
doi.org
Lubar, Steven (April 1987). "Culture and Technological Design in the 19th-Century Pin Industry: John Howe and the Howe Manufacturing Company". Technology and Culture. 28 (2): 253–282. doi:10.2307/3105567. JSTOR3105567.
jstor.org
Lubar, Steven (April 1987). "Culture and Technological Design in the 19th-Century Pin Industry: John Howe and the Howe Manufacturing Company". Technology and Culture. 28 (2): 253–282. doi:10.2307/3105567. JSTOR3105567.