RT Article T1 Assurance Services for Sustainability Reports: Standards and Empirical Evidence JF Journal of business ethics VO 87 IS 1 SP 289 OP 298 A1 Manetti, Giacomo A1 Becatti, Lucia A2 Becatti, Lucia LA English YR 2009 UL https://ixtheo.de/Record/1785634682 AB This article contributes to the growing scholarship on the topic of assurance services for sustainability reports. We first synthetically illustrate the main international standards for the implementation of assurance services regarding the subject documents. The second part of our article is an empirical analysis of reports drawn up on the basis of the current Global Reporting Initiative 2006 guidelines, and looks at how effectively these standards have been implemented, analyzing the different typologies of assurance statement. K1 Sustainability reporting K1 Standards K1 Materiality K1 level of assurance K1 global reporting initiative guidelines K1 credibility gap K1 Corporate Social Responsibility K1 assurance services DO 10.1007/s10551-008-9809-x