(crybwyll am y tro cyntaf)
Elizabeth Lister, Scratches in the Sky: The Battle of Britain (2005),<http://www.bbc.co.uk/history/ww2peopleswar/stories/90/a4354490.shtml> [cyrchwyd 13 Medi 2023] (para. 3 o 7).
(crybwyll yn ddiweddarach)
Lister, para. 4 o 7.
Elizabeth Lister, Scratches in the Sky: The Battle of Britain (2005), <http://www.bbc.co.uk/history/ww2peopleswar/stories/90/
a4354490.shtml> [cyrchwyd 13 Medi 2023] (para. 3 o 7)