- Author: J.F. Steffensen
- Language: English
- Author: Miguel Ottina, Peter Johannes Steffensen, Jesper Kristensen
- Language: English
- Year: 2023
- Author: Victor Steffensen
- Language: English
- Year: 2020
- Author: Asmussen S. Steffensen M
- Language: English
- Year: 2020
- Author: Steffensen Mads, Aggersbjerg Marcus
- Language: Danish
- Year: 2011
- Author: Steffensen Bo, Moos Ingelise
- Language: Danish
- Year: 2010
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- Author: Steffensen Lis Lyngbjerg
- Language: Danish
- Year: 2012
- Author: Lyngbjerg Steffensen Lis
- Language: Danish
- Year: 2013
- Author: Ingrid Steffensen
- Language: English
- Year: 2012