Pithers, B. (1987). Psychology of retention and transfer. Institute of Technical and Adult Teacher Education of Sydney College of Advanced Education.
Lua i Stíl Chicago (17ú heag.)Pithers, Bob. Psychology of Retention and Transfer. [Haymarket, N.S.W.]: Institute of Technical and Adult Teacher Education of Sydney College of Advanced Education, 1987.
Lua MLA (8ú heag.)Pithers, Bob. Psychology of Retention and Transfer. Institute of Technical and Adult Teacher Education of Sydney College of Advanced Education, 1987.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.