Y clwb cysgu cŵl ar nos Wener 13 /
Catt, Louis.
Lewis, Siân,1945-
Llandysul : Gwasg Gomer,
2000.
Addasiad Cymraeg gan = Welsh adaptation by: Siân Lewis.
Friday the thirteenth
Sleepover Club (Imaginary organization)
Sleepovers
Friendship in children
Girls