APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

Penna, C. V. The Planning of Library and Documentation Services. 2nd ed. Paris: UNESCO, 1970.

MLA (9th ed.) Citation

Penna, C. V. The Planning of Library and Documentation Services. 2nd ed. UNESCO, 1970.