APA (7th ed.) Citation

Gretler, A. (1972). The training of adult middle-level personnel. UNESCO.

Chicago Style (17th ed.) Citation

Gretler, Armin. The Training of Adult Middle-level Personnel. Paris: UNESCO, 1972.

MLA (9th ed.) Citation

Gretler, Armin. The Training of Adult Middle-level Personnel. UNESCO, 1972.