APA

National Institute for Occupational Safety and Health, . (2013). Occupational exposure to hexavalent chromium. [Atlanta, Ga.?]: Department of Health and Human Services, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health.

Chicago

National Institute for Occupational Safety and Health, . 2013. Occupational exposure to hexavalent chromium. [Atlanta, Ga.?]: Department of Health and Human Services, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health.

Harvard

National Institute for Occupational Safety and Health, . (2013). Occupational exposure to hexavalent chromium. [Atlanta, Ga.?]: Department of Health and Human Services, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health.

MLA

National Institute for Occupational Safety and Health, . Occupational exposure to hexavalent chromium. [Atlanta, Ga.?]: Department of Health and Human Services, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health. 2013.