Thomson Learning (Firm), Living Text (Firm), & King, D. (2001). Earth systems today: David King ... et al.]. Brooks/Cole.
Lua i Stíl Chicago (17ú heag.)Thomson Learning (Firm), Living Text (Firm), agus David King. Earth Systems Today: David King ... Et Al.]. Pacific Grove, Calif: Brooks/Cole, 2001.
Lua MLA (9ú heag.)Thomson Learning (Firm), et al. Earth Systems Today: David King ... Et Al.]. Brooks/Cole, 2001.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.