Lua APA (7ú heag.)

Schaxel, J. (1987). Julius Schaxel an Ernst Haeckel. Urania-Verlag.

Lua i Stíl Chicago (17ú heag.)

Schaxel, Julius. Julius Schaxel an Ernst Haeckel. Leipzig: Urania-Verlag, 1987.

Lua MLA (8ú heag.)

Schaxel, Julius. Julius Schaxel an Ernst Haeckel. Urania-Verlag, 1987.

Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.