ebrary, Inc, Cohen, H. J., & Liverman, C. T. (2011). Certifying personal protective technologies: Improving worker safety. National Academies Press.
Chicago-referens (17:e uppl.)ebrary, Inc, Howard J. Cohen, och Catharyn T. Liverman. Certifying Personal Protective Technologies: Improving Worker Safety. Washington, D.C.: National Academies Press, 2011.
MLA-referens (9:e uppl.)ebrary, Inc, et al. Certifying Personal Protective Technologies: Improving Worker Safety. National Academies Press, 2011.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.