Não informado. (1969). Learning and Development. McGill University, Centre for Learning and Development.
Lua i Stíl Chicago (17ú heag.)Não informado. Learning and Development. Montreal, Canada: McGill University, Centre for Learning and Development, 1969.
Lua MLA (8ú heag.)Não informado. Learning and Development. McGill University, Centre for Learning and Development, 1969.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.