Allwedd daearyddiaeth : cyfnod allweddol 3.
Clinch, Mike.
University of Wales, Aberystwyth.Centre for Educational Studies.
Qualifications, Curriculum & Assessment Authority for Wales.
Aberystwyth : Canolfan Astudiaethau Addysg,
2003.
Argraffiad Saesneg gwreiddiol = Original English edition : Cheltenham : Stanley Thornes, 1997.
Cyfieithwyd gan = Translated by : Glyn Saunders Jones a Carroll Hughes.
Geography