Bloomfield, D. (1920). Labor maintenance: A practical handbook of employees' service work. Ronald Press.
Chicago-referens (17:e uppl.)Bloomfield, Daniel. Labor Maintenance: A Practical Handbook of Employees' Service Work. New York: Ronald Press, 1920.
MLA-referens (8:e uppl.)Bloomfield, Daniel. Labor Maintenance: A Practical Handbook of Employees' Service Work. Ronald Press, 1920.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.