S. I. Boardman: Stewart, David, first earl of Strathearn and first earl of Caithness (b. in or after 1357?, d. 1386?). In: Henry Colin Gray Matthew, Brian Harrison (Hrsg.): Oxford Dictionary of National Biography, from the earliest times to the year 2000 (ODNB). Oxford University Press, Oxford 2004, ISBN 0-19-861411-X (doi:10.1093/ref:odnb/54325 Lizenz erforderlich), Stand: 2004
