Williams, Mel, Ferreira, Christine,

Williams, Mel, Ferreira, Catherine,

Williams, Mel, Ferreira, Catherine,

Williams, Mel, 1989

Jennings, Terry J., Williams, Mel, Anstey, David, 1992

Williams, Mel, Ferreira, Catherine,

Glover, David, Williams, Mel,

Williams, Mel, 1989

University College of Wales. Centre for Educational Studies, Williams, Mel, Bowles, Diana, Fitzpatrick, Julie, 1993

Ellis, P., Ellis, G., Brown, David,

Thomas, Eric, Griffiths, Merfyn, Owens, G. Wyn, 1974

Ellis, P., Ellis, G., Brown, David, Griffiths, Merfyn, Owens, G. Wyn, 1975

Williams, Mel, Ferreira, Catherine, 1992

Williams, Mel, Ferreira, Catherine, 1992

Williams, Mel, Ferreira, Catherine, 1992

Williams, Mel, Ferreira, Catherine, 1992

Williams, Mel, Ferreira, Catherine,

Williams, Mel, Ferreira, Catherine,

Williams, Mel, Ferreira, Catherine,

Williams, Mel, Ferreira, Catherine,

Williams, Mel, Ferreira, Catherine,

Williams, Mel, Ferreira, Catherine,

Williams, Mel, Ferreira, Christine,

Williams, Mel, Ferreira, Christine,

University College of Wales. Centre for Educational Studies, Williams, Mel, Bowles, Diana, Fitzpatrick, Julie, 1993

Williams, Mel, 1989

Williams, Mel, Ferreira, Catherine,

Williams, Mel, Ferreira, Catherine,

Williams, Mel, 1989

Glover, David, Williams, Mel,

Jennings, Terry J., Williams, Mel, Anstey, David, 1992