Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

Asphaug, Viggo, i Elias Sorensen. Global Positioning Systems. New York: Nova Science Publishers, 2010.

Cita MLA (9th ed.)

Asphaug, Viggo, i Elias Sorensen. Global Positioning Systems. Nova Science Publishers, 2010.