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	1.	Online panel research : a data quality perspective / edited by Mario Callegaro, Reg Baker, Jelke Bethlehem, Anja Goritz, Jon A. Krosnick, Paul J. Lavrakas. by Callegaro, Mario [editor of compilation.] Material type: Text; Format: available online ; Literary form: Not fiction Publisher: Chichester, West Sussex : Wiley, 2014 Availability: Items available for loan: Africa University Main Library (1)Call number: H61.26 ONL 2014. Add to cart (remove)
	2.	Web survey methodology / Mario Callegaro, Katja Lozar Manfreda & Vasja Vehovar. by Callegaro, Mario [author.] Lozar Manfreda, Katja [author.] Vehovar, Vasja [author.] Material type: Text; Format: print ; Literary form: Not fiction Publisher: Los Angeles : SAGE, 2015 Availability: Items available for loan: Africa University Main Library (1)Call number: HM538 CAL 2015. Add to cart (remove)

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