References A Guide To Designing and Conducting Visitor Surveys, Julie Leones, Arizona Cooperative Extension, College of Agriculture, The University of Arizona, September 1998 Trochim, William M. The Research Methods Knowledge Base, 2nd Edition.
RÉFÉRENCES A Guide To Designing and Conducting Visitor Surveys, Julie Leones, Arizona Cooperative Extension, College of Agriculture, The University of Arizona, septembre 1998 Trochim, William M. The Research Methods Knowledge Base, 2nd Edition.