Elkan R. Gamzu, David R. Williams, Barry Schwartz, Robert L. Welker, Gary Hansen, Larry A. Engberg and David R. Thomas (Jul. 27, 1973), Pitfalls of Organismic Concepts: "Learned Laziness"?, 181 (4097), Science, New Series, pp. 367–369Verificați datele pentru: |date= (ajutor)Mentenanță CS1: Nume multiple: lista autorilor (link)