Cita APA (7th ed.)

Wilkins, J., & Dunn, R. (2008). Space: (pocket encyclopedia). Sandcastle Books Ltd..

Cita Chicago (17th ed.)

Wilkins, Jamie, i Robert Dunn. Space: (pocket Encyclopedia). London: Sandcastle Books Ltd., 2008.

Cita MLA (9th ed.)

Wilkins, Jamie, i Robert Dunn. Space: (pocket Encyclopedia). Sandcastle Books Ltd., 2008.