TY  - BOOK
AU  - Trochim, William M.
AU  - Donnelly, James P. ; Arora, Kanika
TI  - Research methods : the essential knowledge base
SN  - 978-1-133-95477-4
U1  - SHS 001.42 T74r 
CY  - Boston, Massachusetts 
KW  - Research - Methodology
ER  -