Não informado. (1969). Learning and Development. McGill University, Centre for Learning and Development.
Chicago-referens (17:e uppl.)Não informado. Learning and Development. Montreal, Canada: McGill University, Centre for Learning and Development, 1969.
MLA-referens (8:e uppl.)Não informado. Learning and Development. McGill University, Centre for Learning and Development, 1969.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.