Causal inferences in nonexperimental research.
Blalock, Hubert.M(jnr),
Causal inferences in nonexperimental research. - ed. - Chapel hill : The University of North Carolina press, 1961. - xii;200p : ill ; cm.
includes index.
Causal inferences in nonexperimental research. - ed. - Chapel hill : The University of North Carolina press, 1961. - xii;200p : ill ; cm.
includes index.