Kerlinger, Fred N.; Lee, Howard B.. (2000.). Foundations of behavioral research / Fred N. Kerlinger, Howard B. Lee. Australia :: Wadsworth,.
Kerlinger, Fred N.; Lee, Howard B.. Foundations of behavioral research / Fred N. Kerlinger, Howard B. Lee. Australia :: Wadsworth,, 2000.
Kerlinger, Fred N.; Lee, Howard B.. Foundations of behavioral research / Fred N. Kerlinger, Howard B. Lee. Australia :: Wadsworth,, 2000..