APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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