Hartley, Adrian (2024-01). “Age of the basal ‘Lower Old Red Sandstone’ Stonehaven Group of Scotland: the oldest reported air-breathing land animal is Silurian
to Yule. Glasgow: William MacLellan. p. 113. ISBN 0-948474-04-1 ^ a b Stonehaven Fireball Association photos and videos of festivities. Retrieved 31 December
Walter Scott ^ Archibald Watt, Highways and byways around Kincardineshire, Stonehaven Heritage Soc., Scotland ^ C. Michael Hogan, Elsick Mounth, The Megalithic