Notes
- 1910 . Book IV: The British Empire , London : Longmans, Green and Co. .
- Dalrymple , Lancelot M. 1903 . The Civil Service Geography: A Manual of Geography, General and Political , London : Crosby Lockwood and Son .
- Hartshorne , Richard . 1939 . The nature of geography: A critical survey of current thought in the light of the past . Annuals of the Association of American Geographers , 29 (3 & 4) (Published by the Association, Pennsylvania.)
- Helburn , Nicholas . 1970 . High School Geography Project , New York : Macmillan .