Hess, E. H. (1973). Imprinting: Early experience and the developmental psychobiology of attachment. Van Nostrand Reinhold.
Lua i Stíl Chicago (17ú heag.)Hess, Eckhard Heinrich. Imprinting: Early Experience and the Developmental Psychobiology of Attachment. New York, USA: Van Nostrand Reinhold, 1973.
Lua MLA (9ú heag.)Hess, Eckhard Heinrich. Imprinting: Early Experience and the Developmental Psychobiology of Attachment. Van Nostrand Reinhold, 1973.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.