Cita APA (7a ed.)

Penna, C. V. (1970). The planning of library and documentation services (2nd rev. and enlarged ed.). Unesco.

Cita Chicago Style (17a ed.)

Penna, Carlos Víctor. The Planning of Library and Documentation Services. 2nd rev. and enlarged ed. Paris: Unesco, 1970.

Cita MLA (9a ed.)

Penna, Carlos Víctor. The Planning of Library and Documentation Services. 2nd rev. and enlarged ed. Unesco, 1970.