Bureau of Labor Statistics, U.S. Department of Labor.«Engineers»(en anglès).Occupational Outlook Handbook, 2006-07 Edition,2006. Arxivat de l'original el 2006-02-19.[Consulta: 19 febrer 2013].
National Society of Professional Engineers.«Frequently Asked Questions About Engineering»(en anglès). Arxivat de l'original el 2006-05-22.[Consulta: 19 febrer 2013].«Science is knowledge based on observed facts and tested truths arranged in an orderly system that can be validated and communicated to other people. Engineering is the creative application of scientific principles used to plan, build, direct, guide, manage, or work on systems to maintain and improve our daily lives»
Bureau of Labor Statistics, U.S. Department of Labor.«Engineers»(en anglès).Occupational Outlook Handbook, 2006-07 Edition,2006. Arxivat de l'original el 2006-02-19.[Consulta: 19 febrer 2013].
National Society of Professional Engineers.«Frequently Asked Questions About Engineering»(en anglès). Arxivat de l'original el 2006-05-22.[Consulta: 19 febrer 2013].«Science is knowledge based on observed facts and tested truths arranged in an orderly system that can be validated and communicated to other people. Engineering is the creative application of scientific principles used to plan, build, direct, guide, manage, or work on systems to maintain and improve our daily lives»
