365746 Penna, C. V. (1970). The planning of library and documentation services. Unesco.
Chicago-čujuhus (17. p.)365746 Penna, C. V. The Planning of Library and Documentation Services. Unesco, 1970.
MLA-čujuhus (9. p.)365746 Penna, C. V. The Planning of Library and Documentation Services. Unesco, 1970.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.