Cyflwyno mecaneg /
Jefferson, Brian.
Beadsworth, Tony.
Wallace, Gwenda Lloyd,1960-
University of Wales, Aberystwyth.Centre for Educational Studies.
Aberystwyth : Canolfan Astudiaethau Addysg,
c2012.
Arg. Saesneg gwreiddiol = Original English ed.: Oxford University Press, 2000.
Yn cynnwys mynegai = Includes index.
Mechanics.
Mechanics