1. Adam, B. (2006). Time. Theory, Culture and Society, 23(2–3), 119–138. doi: 10.1177/0263276406063779 .
2. Cole, M., & Distributed Literacy Consortium. (2006). The fifth dimension: An after-school program built on diversity. New York: Russell Sage Foundation.
3. Diriwächter, R. (2006). The wandering soul in relation to time. Culture and Psychology, 12(2), 161–167. doi: 10.1177/1354067X06064576 .
4. Doughty, V. M. (2007). An instructional designer learns about technology integration: Developmental work research in an urban school. Ph.D. Dissertation. University of Colorado Denver, Denver.
5. Engeström, Y. (1987). Learning by expanding: An activity-theoretical approach to developmental research. Helsinki: Orienta-Konsultit Oy.