I interviewed over 60 thought leaders, each providing me a project case or detailed success story. Many of them gave me supplementary case documents which they have published in their blogs, some magazines, or other public domains. Thes documents either details the cases more or adds to the interviews I conducted. These documents were used in data analysis and are important pieces to my analysis.

Now while writing findings I need to use several of the quotes from these documents they provided me. My dilemma is how to do so? If I use the quotes with full references, then anonymity of the participant's I interviewed is compromised. If I use the quotes without proper references then these quotes will show up as plagiarism. 

Has anyone encountered such problem and solved tactfully and ethically? I will appreciate your advice. What should I do? Any references supporting such approach in which public documents written by an individual participant are used in data analysis? 

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