APA Style
KEUPP, M, M. (2015).
The Northern Sea Route: A Comprehensive Analysis .
Springer Gabler Wiesbaden:
Springer Gabler Wiesbaden.
MLA Style
KEUPP, Marcus, Matthias.
"The Northern Sea Route: A Comprehensive Analysis".
Springer Gabler Wiesbaden:
Springer Gabler Wiesbaden,
2015.
Text.