Feldman, R. S. (1997). Development across the life span. Prentice hall.
Lua i Stíl Chicago (17ú heag.)Feldman, Robert S. Development Across the Life Span. New Jersey: Prentice hall, 1997.
Lua MLA (9ú heag.)Feldman, Robert S. Development Across the Life Span. Prentice hall, 1997.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.