(2011). Sky & Telescope, the Essential Magazine of Astronomy. April 1998. Sky Publishing Corp.
Chicago Style aipamenaSky & Telescope, the Essential Magazine of Astronomy. April 1998. Sky Publishing Corp, 2011.
MLA aipamenaSky & Telescope, the Essential Magazine of Astronomy. April 1998. Sky Publishing Corp, 2011.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.