Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

Gretler, Armin. The Training of Adult Middle Level Personnel. Paris: Unesco, 1972.

Cita MLA (9th ed.)

Gretler, Armin. The Training of Adult Middle Level Personnel. Unesco, 1972.