~ Are You in Business for Your Health? If Not, You Ought to Be: a Question Which Means a Great Saving to Employer and Worker Alike: Standards to be Observed in Developing Personal Efficiency and Production, 1916via internet archive

~ Are You in Business for Your Health? If Not, You Ought to Be: a Question Which Means a Great Saving to Employer and Worker Alike: Standards to be Observed in Developing Personal Efficiency and Production, 1916
via internet archive