The principles of scintific research
Freedman, Paul.
The principles of scintific research - 2 ed. - Oxford : Pergamon Press, 1960 - 228 p.
43107
Investigación.
507.2 / F74
The principles of scintific research - 2 ed. - Oxford : Pergamon Press, 1960 - 228 p.
43107
Investigación.
507.2 / F74
