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.