The following e-books are only a sample of resources that can assist you in designing quality in-depth interviews. Search the Merlin (online library) catalog for books on interviewing and other methods for qualitative research.
Explanations of in-depth-interviews can be found in the following chapter of this book:
Johnson, J. M. (2012). From the Individual Interview to the Interview Society. In Holstein, J. A., Marvasti, A., McKinney, K. D. & Gubrium, J. F (Eds.). The Sage Handbook of Interview Research, 2nd Ed.(103-118). Thousand Oaks, CA: Sage Publications. http://dx.doi.org/10.4135/9781412973588.n8
Module 3 Deliverables: