
- Author: S. Asmussen M. Steffensen
- Language: English
- Year: 2020

- Author: Steffensen J.F.
- Language: English

- Author: June Steffensen Hagen (auth.)
- Language: English
- Year: 1979

- Author: Laura E. Cressey Barrett J. Helmer Jennifer E. Steffensen
- Language: English
- Year: 2014

- Author: Ian S. Markham J. Barney Hawkins IV Justyn Terry Leslie Nuñez Steffensen
- Language: English
- Year: 2013

- Author: Enid Gilbert-Barness Diane E. Spicer Thora S. Steffensen (auth.)
- Language: English
- Year: 2014

- Author: Moller T. Steffensen M.
- Language: English
- Year: 2007

- Author: Thomas Møller Mogens Steffensen
- Language: English
- Year: 2007