TY  - GEN
TY  - GEN
T1  - The principles of scientific research
A1  - Freedman, Paul
LA  - eng
PP  - Oxford ; New York
PB  - Pergamon Press
YR  - 1960
ED  - 2d ed
UL  - https://kansalliskirjasto.finna.fi/Record/fikka.194344
OP  - 227
KW  - research.
ER  -