McKeever, S. (1993). Ensiklopedia SAINS Jilid 4 Benda Hidup. Aries lima.
Lua i Stíl Chicago (17ú heag.)McKeever, Susan. Ensiklopedia SAINS Jilid 4 Benda Hidup. Aries lima, 1993.
Lua MLA (8ú heag.)McKeever, Susan. Ensiklopedia SAINS Jilid 4 Benda Hidup. Aries lima, 1993.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.