Tohutoro APA (7th ed.)
Hoffmann, M. H., Lenhard, J., & Seeger, F. (2005). Activity and Sign: Grounding Mathematics Education. Springer US. https://doi.org/10.1007/b105055
Tohutoru Kātū Chicago (17th ed.)
Hoffmann, Michael H.G, Johannes Lenhard, me Falk Seeger. Activity and Sign: Grounding Mathematics Education. Boston, MA: Springer US, 2005. https://doi.org/10.1007/b105055.
Tohutoro MLA (9th ed.)
Hoffmann, Michael H.G, et al. Activity and Sign: Grounding Mathematics Education. Springer US, 2005. https://doi.org/10.1007/b105055.
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