Gwefr gwyddoniaeth : ffeil athrawon 7 /
Johnson, Keith,1938-
Adamson, Sue.
Williams, Gareth.
Curriculum and Assessment Authority for Wales.
University College of Wales (Aberystwyth, Wales).Centre for Educational Studies.
Aberystwyth : Canolfan Astudiaethau Addysg,
1997, c1995.
Arg. Saesneg gwreiddiol = Original English ed.: Cheltenham: Stanley Thornes (Publishers) Ltd, 1994
Mewn ffeil fodrwy = In ring binder
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