^Thomson, Robert (1836). A Treatise on the Law of Bills of Exchange, Promissory-notes, Bank-notes, Bankers' Notes, and Checks on Bankers, in Scotland. Edinburgh: Adam & Charles Black. p. 95.
^MacDowall, Andrew (Lord Bankton) (1751). An Institute of the Laws of Scotland in Civil Rights. Edinburgh: R. Fleming. p. 489.