Armstrong, W. (1980). Better tools for the job: Specifications for hand tools and equipment. Intermidiate Technology Publications.
Chicago-referens (17:e uppl.)Armstrong, William. Better Tools for the Job: Specifications for Hand Tools and Equipment. London: Intermidiate Technology Publications, 1980.
MLA-referens (8:e uppl.)Armstrong, William. Better Tools for the Job: Specifications for Hand Tools and Equipment. Intermidiate Technology Publications, 1980.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.