Gaya APA

Hester, Jeff et al.. (2002). 21st century astronomy . New York: Norton.

Gaya Chicago

Hester, Jeff et al.. 21st century astronomy. New York: Norton, 2002. Compact Disk.

Gaya MLA

Hester, Jeff et al.. 21st century astronomy. New York: Norton, 2002. Compact Disk.

Gaya Turabian

Hester, Jeff et al.. 21st century astronomy. New York: Norton, 2002. Compact Disk.