TY  - BOOK
AU  - Haykin, David Judson.
ED  - Library of Congress.
TI  - Subject headings: : a practical guiude
T2  - Librarianships and library sources
U1  - 025.33 
PY  - 1951///
CY  - Washington, , D. C.
PB  - Greff Press
KW  - Encabezamientos de materia
ER  -