Merrill, W. S. (1939). Code for classifiers: Principles governing the consistent placing o books in a system of classification (2nd ed.). American Library Association.
Citação norma ChicagoMerrill, William S. Code for Classifiers: Principles Governing the Consistent Placing O Books in a System of Classification. 2nd ed. Chicago: American Library Association, 1939.
Citação norma MLAMerrill, William S. Code for Classifiers: Principles Governing the Consistent Placing O Books in a System of Classification. 2nd ed. American Library Association, 1939.
Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.