1. L A Brown, The Story of Maps (New York, 1951).
2. S Chapin, A survey of the efforts to determine longitude at sea, 1660-1760, Navigation 3 (7) (1953).
3. R Eck, Tobias Mayer, Johann David Michaelis, Carsten Niebuhr und die Göttinger Methode der Längenbestimmung, Gauss-Ges. Göttingen Mitt. 22 (1985), 73-81.
4. E G Forbes, The scientific and technical bases for longitude determination at sea, NTM Schr. Geschichte Natur. Tech. Medizin 16 (1) (1979), 113-118.
5. E G Forbes, Schultz's proposal for finding longitude at sea, J. Hist. Astronom. 2 (1) (1971), 35-41.
6. D Howse, Greenwich time and the discovery of the longitude (Oxford, 1980).
7. D Howse, Nevil Maskelyne: The seaman's astronomer (Cambridge, 1989).
8. W Kokott, Astronomische Längenbestimmung in der frühen Neuzeit, Sudhoffs Arch. 79 (2) (1995), 165-172.
9. E G R Taylor, Old Henry Bond and the Longitude, Mariner's Mirror 25 (1939), 162-169.

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