APA aipamena

Hester, J. (2007). 21st Century Astronomy Stars and Galaxies. McGraw Hill Companies Inc.

Chicago Style aipamena

Hester, Jeff. 21st Century Astronomy Stars and Galaxies. McGraw Hill Companies Inc, 2007.

MLA aipamena

Hester, Jeff. 21st Century Astronomy Stars and Galaxies. McGraw Hill Companies Inc, 2007.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.