Gill, D. (1913). A history and description of the Royal observatory, Cape of Good Hope. His Majesty's Stationery Office.
Chicago-Zitierstil (17. Ausg.)Gill, David. A History and Description of the Royal Observatory, Cape of Good Hope. London: His Majesty's Stationery Office, 1913.
MLA-Zitierstil (9. Ausg.)Gill, David. A History and Description of the Royal Observatory, Cape of Good Hope. His Majesty's Stationery Office, 1913.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.