McConnell et al. (2013)

McConnell, T. J., Parker, J. M., Eberhardt, J., Koehler, M. J., & Lundeberg, M. A. (2013). Virtual professional learning communities: Teachers’ perceptions of virtual versus face-to-face professional development. Journal of Science Education and Technology, 22(3), 267-277. DOI: 10.1007/s10956-012-9391-y