The principles of scientific research /
Freedman, Paul.
The principles of scientific research / - Washington, Public Affairs Press 1950 - 222 p. diagrs. 23 cm.
Research.
813.33 / FRP 1950
The principles of scientific research / - Washington, Public Affairs Press 1950 - 222 p. diagrs. 23 cm.
Research.
813.33 / FRP 1950