From Library Science Database:
School district library supervisors. School Libraries Worldwide, 21(2), 73-84. doi:http://dx.doi.org/10.14265.21.2.006
Ewbank, A. D. (2011). School librarians' advocacy for the profession: Results of a U.S. national survey. School Libraries Worldwide, 17(2), 41-58. Retrieved from https://search.proquest.com/docview/903784289?accountid=13661
Kaplan, A. G. (2010). School library impact studies and school library media programs in the united states. School Libraries Worldwide, 16(2), 55-63. Retrieved from https://search.proquest.com/docview/814872565?accountid=13661
Rawson, C., & Hughes-Hassell, S. (2015). Research by design: The promise of design-based research for school library research. School Libraries Worldwide, 21(2), 11-25. doi:http://dx.doi.org/10.14265.21.2.002
Todd, R. J. (2006). School libraries and evidence-based practice: An integrated approach to evidence. School Libraries Worldwide, 12(2), 31-37. Retrieved from https://search.proquest.com/docview/217752960?accountid=13661
Causal research, also called explanatory research, is the investigation of (research into) cause-and-effect relationships.
Johnston, M. P., & Green, L. S. (2018). Still Polishing the Diamond: School Library Research over the Last Decade. School Library Research, 211- 63.
Morris, R. J., & Cahill, M. (2017). A Study of How We Study: Methodologies of School Library Research 2007 through July 2015. School Library Research, 201-29.
Weeks, A. C., DiScala, J., Barlow, D. L., Massey, S. A., Kodama, C., Hall, R., & ... Follman, R. (2017). The Lilead Survey: A National Study of District-Level Library Supervisors: Roles, Responsibilities, Challenges, and Professional Development Needs. School Library Research, 201-27.
Everhart, N., & Johnston, M. P. (2016). A Proposed Theory of School Librarian Leadership: A Meta-Ethnographic Approach. School Library Research, 191-30.
Weeks, A. C., DiScala, J., Barlow, D. L., Massey, S. A., Kodama, C., Jarrell, K., & ... Hall, R. (2016). The Lilead Survey: A National Study of District-Level Library Supervisors: The Position, Office, and Characteristics of the Supervisor. School Library Research, 191-29.
Church, A. P. (2015). Performance-Based Evaluation and School Librarians. School Library Research, 181-36.
Everhart, N., & Mardis, M. M. (2014). What Do Stakeholders Know about School Library Programs? Results of a Focus Group Evaluation. School Library Research, 171-14.