Note: North Bay is listed twice, once under Hoy and once under South Walls. It is the same bay, with the same geographical co-ordinates shown, and lies between the two islands.
^Office, United States Hydrographic (1962). Publications ... U.S. Government Printing Office. p. 248.
^ abCenter, United States Defense Mapping Agency Hydrographic (1976). Sailing Directions (enroute) for Scotland (1st ed.). Defense Mapping Agency, Hydrographic Center. p. 331.
^ abCenter, United States Defense Mapping Agency Hydrographic (1950). Sailing Directions for the North and East Coasts of Scotland: Cape Wrath to Fife Ness and Including the Orkney, Shetland and Faeroe Islands. Washington: U.S. Government Printing Office. p. 233.
^Center, United States Defense Mapping Agency Hydrographic (1950). Sailing Directions for the North and East Coasts of Scotland: Cape Wrath to Fife Ness and Including the Orkney, Shetland and Faeroe Islands (3rd ed.). Washington: U.S. Government Printing Office. p. 211.
^Office, United States Hydrographic (1915). British Islands Pilot: Faroes, Shetlands, and Orkney Islands and north and east coasts of Scotland. Washington: U.S. Government Printing Office. p. 246.
^ abOffice, United States Hydrographic (1950). Sailing Directions for the North and East Coasts of Scotland: Cape Wrath to Fife Ness and Including the Orkney, Shetland and Faeroe Islands (3rd ed.). Washington: U.S. Government Printing Office. p. 250.
^Great Britain Hydrographic Dept. (1894). North Sea Pilot. Vol. 1. London: J. D. Potter. p. 152.
^United States Hydrographic Office (1950). Sailing Directions for the North and East Coasts of Scotland: Cape Wrath to Fife Ness and Including the Orkney, Shetland and Faeroe Islands (3rd ed.). U.S. Government Printing Office. p. 185.
^United States Hydrographic Office (1950). Sailing Directions for the North and East Coasts of Scotland: Cape Wrath to Fife Ness and Including the Orkney, Shetland and Faeroe Islands. Vol. 34 (3rd ed.). U.S. Government Printing Office. p. 190.
^United States Defense Mapping Agency Hydrographic Center (1976). Sailing Directions (enroute) for Scotland (1st ed.). Defense Mapping Agency, Hydrographic Center. p. 316.
^Haswell-Smith, Hamish (2004). The Scottish Islands: A Comprehensive Guide to Every Scottish Island. Edinburgh: Canongate. p. 10.24. ISBN978-1-84195-454-7.
^United States Hydrographic Office (1950). Sailing Directions for the North and East Coasts of Scotland: Cape Wrath to Fife Ness and Including the Orkney, Shetland and Faeroe Islands (3rd ed.). U.S. Government Printing Office. p. 192.
^Great Britain Hydrographic Dept (1894). North Sea Pilot. London: J. D. Potter. p. 149.
^Hunter, John (2007). Excavations at Pool, Sanday: a multi-period settlement from Neolithic to late Norse times. Investigations in Sanday, Orkney. Vol. 1. Orcadian. p. 170. ISBN978-1-902957-29-6.
^Great Britain Hydrographic Dept (1894). North Sea Pilot (4th ed.). London: J. D. Potter. p. 142.