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- Gretz, Karl F.
Gretz, Karl F. (Nombre personal)
His Consultative selling techniques for financial professionals, 1990: CIP t.p. (Karl F. Gretz, Ph.D.)
His The adolescent psychopath and his parents, 1978: t.p. (Karl Frederick Gretz)
His Empowering innovative people, c1992: t.p. (Karl F. Gretz) jkt. (Master of Education, Tufts Univ.; Ph.D. in educational psychology, B.Y.U.)
The broker's edge, c1995: CIP t.p. (Karl Gretz) t.p. verso (Karl F. Gretz)