Penna, C.V. The planning of library and documentation services C.V. Penna, rev. and enlarged by P.H. Sewell and Herman Liebaers - 2nd rev. impr. - Paris Unesco 1967, 1972 - 158p. ; 21 x 13cm - Unesco manuals for libraries . Bibliography and appendixes at the end LCCN: 634 Subjects--Topical Terms: Documentation Dewey Class. No.: 025.5/P412p