Y clwb cysgu cŵl a'r llong ofod /
Mongredien, Sue.
Lewis, Siân,1945-
Llandysul : Gwasg Gomer,
2003.
Addasiad Cymraeg gan = Welsh adaptation by : Siân Lewis.
Addasiad Saesneg gwreiddiol = Original English edition : London : HarperCollins, 1998.
Sleepover Club (Fictitious characters)
Female friendship
Telescopes
Life on other planets