Lockyer, N. Elementary lessons in astronomy. s.e.
Lua i Stíl Chicago (17ú heag.)Lockyer, Norman. Elementary Lessons in Astronomy. s.l.: s.e.
Lua MLA (9ú heag.)Lockyer, Norman. Elementary Lessons in Astronomy. s.e.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.