Simpkins, J., & Williams, J. I. (1989). Advanced biology (3rd ed.). Unwin Hyman.
Lua i Stíl Chicago (17ú heag.)Simpkins, J., agus J. I. Williams. Advanced Biology. 3rd ed. London: Unwin Hyman, 1989.
Lua MLA (8ú heag.)Simpkins, J., agus J. I. Williams. Advanced Biology. 3rd ed. Unwin Hyman, 1989.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.