A thesis is a substantial document presenting the author's research and findings, submitted in support of candidature for an academic degree. You may wish to find relevant theses:
The reference for a thesis looks like this:
Author surname, initial. (year). Title of thesis. Type of degree/thesis. University: Country.
Morris-Adams, M. (2008). Coherence and understanding in informal conversations between native and non-native speakers of English. PhD thesis. Aston University: UK.