Cita APA (7a ed.)

Asphaug, V., & Sørensen, E. (2010). Global positioning systems. Nova Science Publishers, Inc..

Cita Chicago Style (17a ed.)

Asphaug, Viggo, y Elias Sørensen. Global Positioning Systems. New York: Nova Science Publishers, Inc., 2010.

Cita MLA (8a ed.)

Asphaug, Viggo, y Elias Sørensen. Global Positioning Systems. Nova Science Publishers, Inc., 2010.