APA

Pollak G. K., . (1975). Leadership of discussion groups: case material and theory. New York: Spectrum Publications : distributed by Halsted Press.

Chicago

Pollak Gertrude K, . 1975. Leadership of discussion groups: case material and theory. New York: Spectrum Publications : distributed by Halsted Press.

Harvard

Pollak G. K., . (1975). Leadership of discussion groups: case material and theory. New York: Spectrum Publications : distributed by Halsted Press.

MLA

Pollak Gertrude K, . Leadership of discussion groups: case material and theory. New York: Spectrum Publications : distributed by Halsted Press. 1975.