Adler-Kassner, Linda, & Wardle, Elizabeth. (2016). Naming what we know, classroom edition: Threshold concepts of writing studies. Logan, UT: Utah State University Press.
Flanagan, Mick. (2017). Threshold concepts: Undergraduate teaching, postgraduate training, professional development and school education: A short introduction and a bibliography. Retrieved November 27, 2018, from https://www.ee.ucl.ac.uk/~mflanaga/thresholds.html
Meyer, Jan Erik,
& Land, Ray. (2003). Threshold concepts and
troublesome knowledge: Linkages to ways of thinking and
practising within the disciplines. In Chris Rust (Ed.), Improving student
learning—Ten years on. Oxford, UK: Oxford Centre for Staff & Learning Development.
Perkins, David. (1999). The many faces of constructivism. Educational Leadership, 57(3), 6–11.