@article{Foley91-l1-l2,
  author	= {J., Foley},
  year		= {1991},
  title		= {Vygotsky, Bernstein and Halliday: Towards a Unified Theory of L1 and L2 Learning},
  journal	= {Language, Culture and Curriculum},
  volume	= {4},
  number	= {1},
  pages		= {17--40}
}