APA (7th ed.) Citation
Hoffmann, M. H., Lenhard, J., & Seeger, F. (2005). Activity and Sign: Grounding Mathematics Education. Springer US. https://doi.org/10.1007/b105055
Chicago Style (17th ed.) Citation
Hoffmann, Michael H.G, Johannes Lenhard, and Falk Seeger. Activity and Sign: Grounding Mathematics Education. Boston, MA: Springer US, 2005. https://doi.org/10.1007/b105055.
MLA (9th ed.) Citation
Hoffmann, Michael H.G, et al. Activity and Sign: Grounding Mathematics Education. Springer US, 2005. https://doi.org/10.1007/b105055.
Warning: These citations may not always be 100% accurate.