Mario Callegaro, Katja Lozar Manfreda, and Vasia Vehovar. Web Survey Methodology. Thousand Oaks, CA: Sage. 2015. 318 pp. $47.00 (paper). … View the original here – Mario Callegaro, Katja Lozar Manfreda, and Vasia Vehovar. Web Survey Methodology. Thousand Oaks, CA: Sage. 2015. 318 pp. $47.00 (paper).