MLA

Simpson , W. Douglas. Dunnottar Castle : Historical and Descriptive : an Illustrated Guide Book. 17e ed. Dunecht: Pearson Estates Office, 1993.

APA

Simpson , W. Douglas. (1993). Dunnottar Castle : historical and descriptive : an illustrated guide book. 17e ed. Dunecht: Pearson Estates Office.

Chicago

Simpson , W. Douglas Dunnottar Castle: Historical and Descriptive : an Illustrated Guide Book. 17e ed. Dunecht: Pearson Estates Office, 1993.