Kalthoff, K. (1996). Analysis of biological development. McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Kalthoff, Klaus. Analysis of Biological Development. McGraw-Hill, 1996.
Lua MLA (8ú heag.)Kalthoff, Klaus. Analysis of Biological Development. McGraw-Hill, 1996.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.