Berrill, N. J. (1961). Growth, development, and pattern. W. H. Freeman.
Lua i Stíl Chicago (17ú heag.)Berrill, N. J. Growth, Development, and Pattern. San Francisco: W. H. Freeman, 1961.
Lua MLA (9ú heag.)Berrill, N. J. Growth, Development, and Pattern. W. H. Freeman, 1961.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.