Gaya APA

Gretler,Armin, ., Swanson, C, P. (1972). The training of adult middle-level personnel . Paris: Paris: UNESCO; 1972.

Gaya MLA

Gretler,Armin, ., Swanson, Carl, P.. "The training of adult middle-level personnel". Paris: Paris: UNESCO; 1972, 1972. Text.