Smotiau /
Ridgway, Bill.
Meek, Elin.
Llandysul : Gwasg Gomer,
2005.
Argraffiad Saesneg gwreiddiol = Original English edition : Cheltenham : Nelson Thornes, 2003.
Addasiad Cymraeg gan = Welsh adaptation by : Elin Meek.
Communicable diseases
Welsh language