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Oelkers, J. (Eds.). (1991). "Explorationen". In Explorationen. Bern, Switzerland: Peter Lang CH. Retrieved Apr 23, 2021, from https://www.peterlang.com/view/serial/EXPLOR
Oelkers, Jürgen. "Explorationen". Explorationen. Bern, Switzerland: Peter Lang CH, 1991. <https://www.peterlang.com/view/serial/EXPLOR>. Web. 23 Apr. 2021.
Oelkers, Jürgen, eds. "Explorationen". In Explorationen, (Bern, Switzerland: Peter Lang CH, 1991) accessed Apr 23, 2021, https://www.peterlang.com/view/serial/EXPLOR
Oelkers, J. (eds) (1991). Explorationen. In Explorationen, Bern, Switzerland: Peter Lang CH. available from: <https://www.peterlang.com/view/serial/EXPLOR> [Accessed 23 April 2021]