The principles of scientific research /
Freedom, Paul.
The principles of scientific research / paul Freeman. - 2nd ed. - Oxford : Pergamon Press, 1960. - xvii, 228 p. ; 22 cm.
507.2
The principles of scientific research / paul Freeman. - 2nd ed. - Oxford : Pergamon Press, 1960. - xvii, 228 p. ; 22 cm.
507.2