TY  - BOOK
T1  - Selected survey instruments
LA  - English
PP  - PSSC, Inc.
YR  - 1972
ED  - Trial ed.
UL  - https://tuklas.up.edu.ph/Record/UP-99796217602300904
CN  - H 61 S38 1973
KW  - Social science : Research.
ER  -