Wolpert, L. (2019). Principles of development (Sixth edition.). Oxford University Press.
Lua i Stíl Chicago (17ú heag.)Wolpert, Lewis. Principles of Development. Sixth edition. Oxford, UK: Oxford University Press, 2019.
Lua MLA (9ú heag.)Wolpert, Lewis. Principles of Development. Sixth edition. Oxford University Press, 2019.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.